diff --git a/qlib/backtest/__init__.py b/qlib/backtest/__init__.py
index fa57e354b..ab3d29408 100644
--- a/qlib/backtest/__init__.py
+++ b/qlib/backtest/__init__.py
@@ -13,7 +13,7 @@ from .executor import BaseExecutor
 from .backtest import backtest_loop
 from .backtest import collect_data_loop
 from .order import Order
-from .utils import CommonInfrastructure, TradeCalendarManager
+from .utils import CommonInfrastructure, LevelInfrastructure, TradeCalendarManager
 from ..utils import init_instance_by_config
 from ..log import get_module_logger
 from ..config import C
diff --git a/qlib/backtest/account.py b/qlib/backtest/account.py
index 67f7b056a..3ef1cdd03 100644
--- a/qlib/backtest/account.py
+++ b/qlib/backtest/account.py
@@ -3,7 +3,7 @@
 
 
 import copy
-from typing import Dict, List
+from typing import Dict, List, Tuple
 from qlib.utils import init_instance_by_config
 import warnings
 import pandas as pd
@@ -250,6 +250,7 @@ class Account:
         outer_trade_decision: BaseTradeDecision,
         trade_info: list = None,
         inner_order_indicators: List[Dict[str, pd.Series]] = None,
+        decision_list: List[Tuple[BaseTradeDecision, pd.Timestamp, pd.Timestamp]] = None,
         indicator_config: dict = {},
     ):
         """update account at each trading bar step
@@ -274,6 +275,9 @@ class Account:
             indicators of inner executor, by default None
             - necessary if atomic is False
             - used to aggregate outer indicators
+        decision_list: List[Tuple[BaseTradeDecision, pd.Timestamp, pd.Timestamp]] = None,
+            The decision list of the inner level: List[Tuple[<decision>, <start_time>, <end_time>]]
+            The inner level
         indicator_config : dict, optional
             config of calculating indicators, by default {}
         """
@@ -289,22 +293,27 @@ class Account:
             # report is portfolio related analysis
             self.update_report(trade_start_time, trade_end_time)
 
-        # indicator is trading (e.g. high-frequency order execution) related analysis
-        self.indicator.clear()
+        # TODO: will skip empty decisions make it faster?  `outer_trade_decision.empty():`
 
+        # indicator is trading (e.g. high-frequency order execution) related analysis
+        self.indicator.reset()
+
+        # aggregate the information for each order
         if atomic:
             self.indicator.update_order_indicators(trade_info)
         else:
             self.indicator.agg_order_indicators(
-                trade_start_time,
-                trade_end_time,
                 inner_order_indicators,
+                decision_list=decision_list,
                 outer_trade_decision=outer_trade_decision,
                 trade_exchange=trade_exchange,
                 indicator_config=indicator_config,
             )
 
+        # aggregate all the order metrics a single step
         self.indicator.cal_trade_indicators(trade_start_time, self.freq, indicator_config)
+
+        # record the metrics
         self.indicator.record(trade_start_time)
 
     def get_report(self):
diff --git a/qlib/backtest/backtest.py b/qlib/backtest/backtest.py
index 573c874b0..89b8c7830 100644
--- a/qlib/backtest/backtest.py
+++ b/qlib/backtest/backtest.py
@@ -55,14 +55,13 @@ def collect_data_loop(
         trade decision
     """
     trade_executor.reset(start_time=start_time, end_time=end_time)
-    level_infra = trade_executor.get_level_infra()
-    trade_strategy.reset(level_infra=level_infra)
+    trade_strategy.reset(level_infra=trade_executor.get_level_infra())
 
     with tqdm(total=trade_executor.trade_calendar.get_trade_len(), desc="backtest loop") as bar:
         _execute_result = None
         while not trade_executor.finished():
             _trade_decision: BaseTradeDecision = trade_strategy.generate_trade_decision(_execute_result)
-            _execute_result = yield from trade_executor.collect_data(_trade_decision)
+            _execute_result = yield from trade_executor.collect_data(_trade_decision, level=0)
             bar.update(1)
 
     if return_value is not None:
diff --git a/qlib/backtest/executor.py b/qlib/backtest/executor.py
index c4807ebde..b99380c54 100644
--- a/qlib/backtest/executor.py
+++ b/qlib/backtest/executor.py
@@ -1,13 +1,16 @@
+from abc import abstractclassmethod, abstractmethod
 import copy
+from types import GeneratorType
+from qlib.backtest.account import Account
 import warnings
 import pandas as pd
-from typing import List, Union
+from typing import List, Tuple, Union
 
 from qlib.backtest.report import Indicator
 
-from .order import Order, BaseTradeDecision
+from .order import EmptyTradeDecision, Order, BaseTradeDecision
 from .exchange import Exchange
-from .utils import TradeCalendarManager, CommonInfrastructure, LevelInfrastructure
+from .utils import TradeCalendarManager, CommonInfrastructure, LevelInfrastructure, get_start_end_idx
 
 from ..utils import init_instance_by_config
 from ..utils.time import Freq
@@ -26,6 +29,7 @@ class BaseExecutor:
         generate_report: bool = False,
         verbose: bool = False,
         track_data: bool = False,
+        trade_exchange: Exchange = None,
         common_infra: CommonInfrastructure = None,
         **kwargs,
     ):
@@ -62,8 +66,8 @@ class BaseExecutor:
                 {
                     'show_indicator': True,
                     'pa_config': {
-                        'base_value': 'twap',
-                        'weight_method': 'value_weighted',
+                        "agg": "twap",  # "vwap"
+                        "price": "$close", # default to use deal price of the exchange
                     },
                     'ffr_config':{
                         'weight_method': 'value_weighted',
@@ -77,6 +81,12 @@ class BaseExecutor:
             whether to generate trade_decision, will be used when training rl agent
             - If `self.track_data` is true, when making data for training, the input `trade_decision` of `execute` will be generated by `collect_data`
             - Else,  `trade_decision` will not be generated
+
+        trade_exchange : Exchange
+            exchange that provides market info, used to generate report
+            - If generate_report is None, trade_exchange will be ignored
+            - Else If `trade_exchange` is None, self.trade_exchange will be set with common_infra
+
         common_infra : CommonInfrastructure, optional:
             common infrastructure for backtesting, may including:
             - trade_account : Account, optional
@@ -90,7 +100,9 @@ class BaseExecutor:
         self.generate_report = generate_report
         self.verbose = verbose
         self.track_data = track_data
-        self.reset(start_time=start_time, end_time=end_time, track_data=track_data, common_infra=common_infra)
+        self._trade_exchange = trade_exchange
+        self.level_infra = LevelInfrastructure()
+        self.reset(start_time=start_time, end_time=end_time, common_infra=common_infra)
 
     def reset_common_infra(self, common_infra):
         """
@@ -105,60 +117,106 @@ class BaseExecutor:
         if common_infra.has("trade_account"):
             # NOTE: there is a trick in the code.
             # copy is used instead of deepcopy. So positions are shared
-            self.trade_account = copy.copy(common_infra.get("trade_account"))
+            self.trade_account: Account = copy.copy(common_infra.get("trade_account"))
             self.trade_account.reset(freq=self.time_per_step, init_report=True, port_metr_enabled=self.generate_report)
 
-    def reset(self, track_data: bool = None, common_infra: CommonInfrastructure = None, **kwargs):
+    @property
+    def trade_exchange(self) -> Exchange:
+        """get trade exchange in a prioritized order"""
+        return getattr(self, "_trade_exchange", None) or self.common_infra.get("trade_exchange")
+
+    @property
+    def trade_calendar(self) -> TradeCalendarManager:
+        """
+        Though trade calendar can be accessed from multiple sources, but managing in a centralized way will make the
+        code easier
+        """
+        return self.level_infra.get("trade_calendar")
+
+    def reset(self, common_infra: CommonInfrastructure = None, **kwargs):
         """
         - reset `start_time` and `end_time`, used in trade calendar
-        - reset `track_data`, used when making data for multi-level training
         - reset `common_infra`, used to reset `trade_account`, `trade_exchange`, .etc
         """
 
-        if track_data is not None:
-            self.track_data = track_data
-
         if "start_time" in kwargs or "end_time" in kwargs:
             start_time = kwargs.get("start_time")
             end_time = kwargs.get("end_time")
-            self.trade_calendar = TradeCalendarManager(
-                freq=self.time_per_step, start_time=start_time, end_time=end_time
-            )
-
+            self.level_infra.reset_cal(freq=self.time_per_step, start_time=start_time, end_time=end_time)
         if common_infra is not None:
             self.reset_common_infra(common_infra)
 
     def get_level_infra(self):
-        return LevelInfrastructure(trade_calendar=self.trade_calendar)
+        return self.level_infra
 
     def finished(self):
         return self.trade_calendar.finished()
 
-    def execute(self, trade_decision):
+    def execute(self, trade_decision: BaseTradeDecision, level: int = 0):
         """execute the trade decision and return the executed result
 
+        NOTE: this function is never used directly in the framework. Should we delete it?
+
         Parameters
         ----------
         trade_decision : BaseTradeDecision
 
+        level : int
+            the level of current executor
+
         Returns
         ----------
         execute_result : List[object]
             the executed result for trade decision
         """
-        raise NotImplementedError("execute is not implemented!")
+        return_value = {}
+        for _decision in self.collect_data(trade_decision, return_value=return_value, level=level):
+            pass
+        return return_value.get("execute_result")
 
-    def collect_data(self, trade_decision):
+    @abstractclassmethod
+    def _collect_data(self, trade_decision: BaseTradeDecision, level: int = 0) -> Tuple[List[object], dict]:
+        """
+        Please refer to the doc of collect_data
+        The only difference between `_collect_data` and `collect_data` is that some common steps are moved into
+        collect_data
+
+        Parameters
+        ----------
+        Please refer to the doc of collect_data
+
+
+        Returns
+        -------
+        Tuple[List[object], dict]:
+            (<the executed result for trade decision>, <the extra kwargs for `self.trade_account.update_bar_end`>)
+        """
+
+    def collect_data(
+        self, trade_decision: BaseTradeDecision, return_value: dict = None, level: int = 0
+    ) -> List[object]:
         """Generator for collecting the trade decision data for rl training
 
+        his function will make a step forward
+
         Parameters
         ----------
         trade_decision : BaseTradeDecision
 
+        level : int
+            the level of current executor. 0 indicates the top level
+
+        return_value : dict
+            the mem address to return the value
+            e.g.  {"return_value": <the executed result>}
+
         Returns
         ----------
         execute_result : List[object]
-            the executed result for trade decision
+            the executed result for trade decision.
+            ** NOTE!!!! **:
+            1) This is necessary,  The return value of geenrator will be used in NestedExecutor
+            2) Please note the executed results are not merged.
 
         Yields
         -------
@@ -167,7 +225,36 @@ class BaseExecutor:
         """
         if self.track_data:
             yield trade_decision
-        return self.execute(trade_decision)
+
+        atomic = not issubclass(self.__class__, NestedExecutor)  #  issubclass(A, A) is True
+
+        if atomic and trade_decision.get_range_limit(default_value=None) is not None:
+            raise ValueError("atomic executor doesn't support specify `range_limit`")
+
+        obj = self._collect_data(trade_decision=trade_decision, level=level)
+
+        if isinstance(obj, GeneratorType):
+            res, kwargs = yield from obj
+        else:
+            # Some concrete executor don't have inner decisions
+            res, kwargs = obj
+
+        trade_start_time, trade_end_time = self.trade_calendar.get_cur_step_time()
+        # Account will not be changed in this function
+        self.trade_account.update_bar_end(
+            trade_start_time,
+            trade_end_time,
+            self.trade_exchange,
+            atomic=atomic,
+            outer_trade_decision=trade_decision,
+            indicator_config=self.indicator_config,
+            **kwargs,
+        )
+
+        self.trade_calendar.step()
+        if return_value is not None:
+            return_value.update({"execute_result": res})
+        return res
 
     def get_all_executors(self):
         """get all executors"""
@@ -192,7 +279,7 @@ class NestedExecutor(BaseExecutor):
         verbose: bool = False,
         track_data: bool = False,
         skip_empty_decision: bool = True,
-        trade_exchange: Exchange = None,
+        align_range_limit: bool = True,
         common_infra: CommonInfrastructure = None,
         **kwargs,
     ):
@@ -203,24 +290,24 @@ class NestedExecutor(BaseExecutor):
             trading env in each trading bar.
         inner_strategy : BaseStrategy
             trading strategy in each trading bar
-        trade_exchange : Exchange
-            exchange that provides market info, used to generate report
-            - If generate_report is None, trade_exchange will be ignored
-            - Else If `trade_exchange` is None, self.trade_exchange will be set with common_infra
         skip_empty_decision: bool
-            Will the executor skip the inner loop when the decision is empty.
+            Will the executor skip call inner loop when the decision is empty.
             It should be False in following cases
             - The decisions may be updated by steps
             - The inner executor may not follow the decisions from the outer strategy
+        align_range_limit: bool
+            force to align the index_range decision
+            It is only for nested executor, because range_limit is given by outer strategy
         """
-        self.inner_executor = init_instance_by_config(
+        self.inner_executor: BaseExecutor = init_instance_by_config(
             inner_executor, common_infra=common_infra, accept_types=BaseExecutor
         )
-        self.inner_strategy = init_instance_by_config(
+        self.inner_strategy: BaseStrategy = init_instance_by_config(
             inner_strategy, common_infra=common_infra, accept_types=BaseStrategy
         )
 
         self._skip_empty_decision = skip_empty_decision
+        self._align_range_limit = align_range_limit
 
         super(NestedExecutor, self).__init__(
             time_per_step=time_per_step,
@@ -234,82 +321,82 @@ class NestedExecutor(BaseExecutor):
             **kwargs,
         )
 
-        if trade_exchange is not None:
-            self.trade_exchange = trade_exchange
-
     def reset_common_infra(self, common_infra):
         """
         reset infrastructure for trading
-            - reset trade_exchange
             - reset inner_strategyand inner_executor common infra
         """
         super(NestedExecutor, self).reset_common_infra(common_infra)
 
-        if common_infra.has("trade_exchange"):
-            self.trade_exchange = common_infra.get("trade_exchange")
-
         self.inner_executor.reset_common_infra(common_infra)
         self.inner_strategy.reset_common_infra(common_infra)
 
     def _init_sub_trading(self, trade_decision):
-        trade_step = self.trade_calendar.get_trade_step()
-        trade_start_time, trade_end_time = self.trade_calendar.get_step_time(trade_step)
+        trade_start_time, trade_end_time = self.trade_calendar.get_cur_step_time()
         self.inner_executor.reset(start_time=trade_start_time, end_time=trade_end_time)
         sub_level_infra = self.inner_executor.get_level_infra()
+        self.level_infra.set_sub_level_infra(sub_level_infra)
         self.inner_strategy.reset(level_infra=sub_level_infra, outer_trade_decision=trade_decision)
 
-    def execute(self, trade_decision):
-        return_value = {}
-        for _decision in self.collect_data(trade_decision, return_value):
-            pass
-        return return_value.get("execute_result")
+    def _update_trade_decision(self, trade_decision: BaseTradeDecision) -> BaseTradeDecision:
+        # outter strategy have chance to update decision each iterator
+        updated_trade_decision = trade_decision.update(self.inner_executor.trade_calendar)
+        if updated_trade_decision is not None:
+            trade_decision = updated_trade_decision
+            # NEW UPDATE
+            # create a hook for inner strategy to update outter decision
+            self.inner_strategy.alter_outer_trade_decision(trade_decision)
+        return trade_decision
 
-    def collect_data(self, trade_decision: BaseTradeDecision, return_value=None):
-        if self.track_data:
-            yield trade_decision
+    # def _get_inner_trade_decision(self, outer_trade_decision: BaseTradeDecision, inner_execute_result):
+    #     # In some cases, the inner strategy can be skipped, but the inner executor should keep running
+    #     if outer_trade_decision.empty() and self._skip_empty_decision:
+    #         return EmptyTradeDecision(self.inner_strategy)
+    #     return self.inner_strategy.generate_trade_decision(inner_execute_result)
+    # _inner_trade_decision = self._get_inner_trade_decision(trade_decision, _inner_execute_result)
+
+    def _collect_data(self, trade_decision: BaseTradeDecision, level: int = 0):
         execute_result = []
         inner_order_indicators = []
+        decision_list = []
+        # NOTE:
+        # - this is necessary to calculating the steps in sub level
+        # - more detailed information will be set into trade decision
+        self._init_sub_trading(trade_decision)
 
-        if not (trade_decision.empty() and self._skip_empty_decision):
-            _inner_execute_result = None
-            self._init_sub_trading(trade_decision)
-            while not self.inner_executor.finished():
-                # outter strategy have chance to update decision each iterator
-                updated_trade_decision = trade_decision.update(self.inner_executor.trade_calendar)
-                if updated_trade_decision is not None:
-                    trade_decision = updated_trade_decision
-                    # NEW UPDATE
-                    # create a hook for inner strategy to update outter decision
-                    self.inner_strategy.alter_outer_trade_decision(trade_decision)
+        _inner_execute_result = None
+        while not self.inner_executor.finished():
+            trade_decision = self._update_trade_decision(trade_decision)
+
+            if trade_decision.empty() and self._skip_empty_decision:
+                # give one chance for outer stategy to update the strategy
+                # - For updating some information in the sub executor(the strategy have no knowledge of the inner
+                # executor when generating the decision)
+                break
+
+            sub_cal: TradeCalendarManager = self.inner_executor.trade_calendar
+            start_idx, end_idx = get_start_end_idx(sub_cal, trade_decision)
+            if not self._align_range_limit or start_idx <= sub_cal.get_trade_step() <= end_idx:
+                # if force align the range limit, skip the steps outside the decision range limit
 
                 _inner_trade_decision = self.inner_strategy.generate_trade_decision(_inner_execute_result)
+                # NOTE sub_cal.get_cur_step_time() must be called before collect_data in case of step shifting
+                decision_list.append((_inner_trade_decision, *sub_cal.get_cur_step_time()))
 
                 # NOTE: Trade Calendar will step forward in the follow line
                 _inner_execute_result = yield from self.inner_executor.collect_data(
-                    trade_decision=_inner_trade_decision
+                    trade_decision=_inner_trade_decision, level=level + 1
                 )
-
                 execute_result.extend(_inner_execute_result)
+
                 inner_order_indicators.append(
                     self.inner_executor.trade_account.get_trade_indicator().get_order_indicator()
                 )
+            else:
+                # do nothing and just step forward
+                sub_cal.step()
 
-        trade_step = self.trade_calendar.get_trade_step()
-        trade_start_time, trade_end_time = self.trade_calendar.get_step_time(trade_step)
-        self.trade_account.update_bar_end(
-            trade_start_time,
-            trade_end_time,
-            self.trade_exchange,
-            atomic=False,
-            outer_trade_decision=trade_decision,
-            inner_order_indicators=inner_order_indicators,
-            indicator_config=self.indicator_config,
-        )
-
-        self.trade_calendar.step()
-        if return_value is not None:
-            return_value.update({"execute_result": execute_result})
-        return execute_result
+        return execute_result, {"inner_order_indicators": inner_order_indicators, "decision_list": decision_list}
 
     def get_all_executors(self):
         """get all executors, including self and inner_executor.get_all_executors()"""
@@ -337,17 +424,13 @@ class SimulatorExecutor(BaseExecutor):
         generate_report: bool = False,
         verbose: bool = False,
         track_data: bool = False,
-        trade_exchange: Exchange = None,
         common_infra: CommonInfrastructure = None,
-        trade_type: str = TT_PARAL,
+        trade_type: str = TT_SERIAL,
         **kwargs,
     ):
         """
         Parameters
         ----------
-        trade_exchange : Exchange
-            exchange that provides market info, used to deal order and generate report
-            - If `trade_exchange` is None, self.trade_exchange will be set with common_infra
         trade_type: str
             please refer to the doc of `TT_SERIAL` & `TT_PARAL`
         """
@@ -362,20 +445,9 @@ class SimulatorExecutor(BaseExecutor):
             common_infra=common_infra,
             **kwargs,
         )
-        if trade_exchange is not None:
-            self.trade_exchange = trade_exchange
 
         self.trade_type = trade_type
 
-    def reset_common_infra(self, common_infra):
-        """
-        reset infrastructure for trading
-            - reset trade_exchange
-        """
-        super(SimulatorExecutor, self).reset_common_infra(common_infra)
-        if common_infra.has("trade_exchange"):
-            self.trade_exchange = common_infra.get("trade_exchange")
-
     def _get_order_iterator(self, trade_decision: BaseTradeDecision) -> List[Order]:
         """
 
@@ -405,10 +477,9 @@ class SimulatorExecutor(BaseExecutor):
             raise NotImplementedError(f"This type of input is not supported")
         return order_it
 
-    def execute(self, trade_decision: BaseTradeDecision):
+    def _collect_data(self, trade_decision: BaseTradeDecision, level: int = 0):
 
-        trade_step = self.trade_calendar.get_trade_step()
-        trade_start_time, trade_end_time = self.trade_calendar.get_step_time(trade_step)
+        trade_start_time, _ = self.trade_calendar.get_cur_step_time()
         execute_result = []
 
         for order in self._get_order_iterator(trade_decision):
@@ -450,16 +521,4 @@ class SimulatorExecutor(BaseExecutor):
                     print("[W {:%Y-%m-%d %H:%M:%S}]: {} wrong.".format(trade_start_time, order.stock_id))
                 # do nothing
                 pass
-
-        # Account will not be changed in this function
-        self.trade_account.update_bar_end(
-            trade_start_time,
-            trade_end_time,
-            self.trade_exchange,
-            atomic=True,
-            outer_trade_decision=trade_decision,
-            trade_info=execute_result,
-            indicator_config=self.indicator_config,
-        )
-        self.trade_calendar.step()
-        return execute_result
+        return execute_result, {"trade_info": execute_result}
diff --git a/qlib/backtest/order.py b/qlib/backtest/order.py
index 20c97aa90..1a88ded93 100644
--- a/qlib/backtest/order.py
+++ b/qlib/backtest/order.py
@@ -3,6 +3,7 @@
 # TODO: rename it with decision.py
 from __future__ import annotations
 from enum import IntEnum
+from qlib.log import get_module_logger
 
 # try to fix circular imports when enabling type hints
 from typing import TYPE_CHECKING
@@ -179,7 +180,7 @@ class BaseTradeDecision:
         2. Same as `case 1.3`
     """
 
-    def __init__(self, strategy: BaseStrategy):
+    def __init__(self, strategy: BaseStrategy, idx_range: Tuple[int, int] = None):
         """
         Parameters
         ----------
@@ -187,6 +188,8 @@ class BaseTradeDecision:
             The strategy who make the decision
         """
         self.strategy = strategy
+        self.total_step = None  # upper strategy has no knowledge about the sub executor before `_init_sub_trading`
+        self.idx_range = idx_range
 
     def get_decision(self) -> List[object]:
         """
@@ -207,7 +210,11 @@ class BaseTradeDecision:
 
     def update(self, trade_calendar: TradeCalendarManager) -> Union["BaseTradeDecision", None]:
         """
-        Be called at the **start** of each step
+        Be called at the **start** of each step.
+
+        This function is designn for following purpose
+        1) Leave a hook for the strategy who make `self` decision to update the decision itself
+        2) Update some information from the inner executor calendar
 
         Parameters
         ----------
@@ -221,13 +228,27 @@ class BaseTradeDecision:
         BaseTradeDecision:
             New update, use new decision
         """
+        # purpose 1)
+        self.total_step = trade_calendar.get_trade_len()
+        if self.idx_range is not None:
+            logger = get_module_logger("decision")
+            start_idx, end_idx = self.idx_range
+            if start_idx < 0 or end_idx >= self.total_step:
+                logger.warning(f"{self.idx_range} go beyound the total_step({self.total_step}), it will be clipped")
+                self.idx_range = max(0, start_idx), min(self.total_step - 1, end_idx)
+
+        # purpose 2)
         return self.strategy.update_trade_decision(self, trade_calendar)
 
-    def get_range_limit(self) -> Tuple[int, int]:
+    def get_range_limit(self, **kwargs) -> Tuple[int, int]:
         """
         return the expected step range for limiting the decision execution time
         Both left and right are **closed**
 
+        **kwargs:
+            {"default_value": <default_value>}
+            # using dict is for distinguish no value provided or None provided
+
         Returns
         -------
         Tuple[int, int]:
@@ -235,12 +256,32 @@ class BaseTradeDecision:
         Raises
         ------
         NotImplementedError:
-            If the decision can't provide a unified start and end
+            If the following criteria meet
+            1) the decision can't provide a unified start and end
+            2) default_value is None
         """
-        raise NotImplementedError(f"Please implement the `func` method")
+        if self.idx_range is None:
+            if "default_value" in kwargs:
+                return kwargs["default_value"]
+            else:
+                # Default to get full index
+                raise NotImplementedError(f"The decision didn't provide an index range")
+        return self.idx_range
 
     def empty(self) -> bool:
-        return len(self.get_decision()) == 0
+        for obj in self.get_decision():
+            if isinstance(obj, Order):
+                # Zero amount order will be treated as empty
+                if not np.isclose(obj.amount, 0.0):
+                    return False
+            else:
+                return True
+        return True
+
+
+class EmptyTradeDecision(BaseTradeDecision):
+    def empty(self) -> bool:
+        return True
 
 
 class TradeDecisionWO(BaseTradeDecision):
@@ -249,16 +290,9 @@ class TradeDecisionWO(BaseTradeDecision):
     Besides, the time_range is also included.
     """
 
-    def __init__(self, order_list: List[Order], strategy: BaseStrategy, idx_range: Tuple = None):
-        super().__init__(strategy)
+    def __init__(self, order_list: List[Order], strategy: BaseStrategy, idx_range: Tuple[int, int] = None):
+        super().__init__(strategy, idx_range=idx_range)
         self.order_list = order_list
-        self.idx_range = idx_range
-
-    def get_range_limit(self) -> Tuple[int, int]:
-        if self.idx_range is None:
-            # Default to get full index
-            raise NotImplementedError(f"The decision didn't provide an index range")
-        return self.idx_range
 
     def get_decision(self) -> List[object]:
         return self.order_list
diff --git a/qlib/backtest/report.py b/qlib/backtest/report.py
index 43a6a455b..138a44faa 100644
--- a/qlib/backtest/report.py
+++ b/qlib/backtest/report.py
@@ -4,21 +4,23 @@
 
 from collections import OrderedDict
 from logging import warning
-from qlib.backtest.exchange import Exchange
-from typing import Dict, List
-from qlib.backtest.order import BaseTradeDecision, Order, OrderDir
-import pandas as pd
-import numpy as np
 import pathlib
+from typing import Dict, List, Tuple
 import warnings
-from pandas.core import groupby
 
+import numpy as np
+import pandas as pd
+from pandas.core import groupby
 from pandas.core.frame import DataFrame
 
-from ..utils.time import Freq
-from ..utils.resam import resam_ts_data, get_higher_eq_freq_feature
+from qlib.backtest.exchange import Exchange
+from qlib.backtest.order import BaseTradeDecision, Order, OrderDir
+from qlib.backtest.utils import TradeCalendarManager
+
 from ..data import D
 from ..tests.config import CSI300_BENCH
+from ..utils.resam import get_higher_eq_freq_feature, resam_ts_data
+from ..utils.time import Freq
 
 
 class Report:
@@ -251,14 +253,21 @@ class Indicator:
     """
 
     def __init__(self):
+        # order indicator is metrics for a single order for a specific step
         self.order_indicator_his = OrderedDict()
-        self.order_indicator = OrderedDict()
-        self.trade_indicator_his = OrderedDict()
-        self.trade_indicator = OrderedDict()
+        self.order_indicator: Dict[str, pd.Series] = OrderedDict()
 
-    def clear(self):
+        # trade indicator is metrics for all orders for a specific step
+        self.trade_indicator_his = OrderedDict()
+        self.trade_indicator: Dict[str, float] = OrderedDict()
+
+        self._trade_calendar = None
+
+    # def reset(self, trade_calendar: TradeCalendarManager):
+    def reset(self):
         self.order_indicator = OrderedDict()
         self.trade_indicator = OrderedDict()
+        # self._trade_calendar = trade_calendar
 
     def record(self, trade_start_time):
         self.order_indicator_his[trade_start_time] = self.order_indicator
@@ -294,9 +303,14 @@ class Indicator:
     def _update_order_price_advantage(self):
         # NOTE:
         # trade_price and baseline price will be same on the lowest-level
-        # So Pa should be 0
+        # So Pa should be 0 or do nothing
         self.order_indicator["pa"] = 0
 
+    def update_order_indicators(self, trade_info: list):
+        self._update_order_trade_info(trade_info=trade_info)
+        self._update_order_fulfill_rate()
+        self._update_order_price_advantage()
+
     def _agg_order_trade_info(self, inner_order_indicators: List[Dict[str, pd.Series]]):
         inner_amount = pd.Series()
         deal_amount = pd.Series()
@@ -312,7 +326,7 @@ class Indicator:
             )
             trade_value = trade_value.add(_order_indicator["trade_value"], fill_value=0)
             trade_cost = trade_cost.add(_order_indicator["trade_cost"], fill_value=0)
-            trade_dir = trade_dir.add(_order_indicator["trade_dir"])
+            trade_dir = trade_dir.add(_order_indicator["trade_dir"], fill_value=0)
 
         trade_dir = trade_dir.apply(Order.parse_dir)
 
@@ -335,24 +349,77 @@ class Indicator:
     def _agg_order_fulfill_rate(self):
         self.order_indicator["ffr"] = self.order_indicator["deal_amount"] / self.order_indicator["amount"]
 
-    def _agg_order_price_advantage(
+    def _get_base_vol_pri(
         self,
-        inner_order_indicators: List[Dict[str, pd.Series]],
+        inst: str,
         trade_start_time: pd.Timestamp,
         trade_end_time: pd.Timestamp,
+        direction: OrderDir,
+        decision: BaseTradeDecision,
+        trade_exchange: Exchange,
+        pa_config: dict = {},
+    ):
+        """Get the base volume and price information"""
+
+        agg = pa_config.get("agg", "twap").lower()
+        price = pa_config.get("price", "deal_price").lower()
+
+        if price == "deal_price":
+            price_s = trade_exchange.get_deal_price(
+                inst, trade_start_time, trade_end_time, direction=direction, method=None
+            )
+        else:
+            raise NotImplementedError(f"This type of input is not supported")
+
+        # NOTE: there are some zeros in the trading price. These cases are known meaningless
+        # for aligning the previous logic, remove it.
+        # price_s = price_s.mask(np.isclose(price_s, 0))
+
+        if agg == "vwap":
+            volume_s = trade_exchange.get_volume(inst, trade_start_time, trade_end_time, method=None)
+        elif agg == "twap":
+            volume_s = pd.Series(1, index=price_s.index)
+        else:
+            raise NotImplementedError(f"This type of input is not supported")
+
+        # no sub executor on the lowest level
+        # So range_limit an total step will all be None
+        total_step = decision.total_step
+        if total_step is None:
+            total_step = 1
+        range_limit = decision.get_range_limit(default_value=(0, total_step - 1))
+
+        assert volume_s.shape[0] % total_step == 0, "The price series can't  be divided by step length"
+        factor = volume_s.shape[0] // total_step
+
+        slc = slice(range_limit[0] * factor, (range_limit[1] + 1) * factor)
+
+        volume_s = volume_s.iloc[slc]
+        price_s = price_s.iloc[slc]
+
+        base_volume = volume_s.sum().item()
+        base_price = ((price_s * volume_s).sum() / base_volume).item()
+
+        return base_price, base_volume
+
+    def _agg_base_price(
+        self,
+        inner_order_indicators: List[Dict[str, pd.Series]],
+        decision_list: List[Tuple[BaseTradeDecision, pd.Timestamp, pd.Timestamp]],
         trade_exchange: Exchange,
         pa_config: dict = {},
     ):
         """
+        # NOTE:!!!!
+        # Strong assumption!!!!!!
+        # the correctness of the base_price relies on that the **same** exchange is used
 
         Parameters
         ----------
         inner_order_indicators : List[Dict[str, pd.Series]]
             the indicators of account of inner executor
-        trade_start_time : pd.Timestamp
-            the start_time of the trade period, for slicing
-        trade_end_time : pd.Timestamp
-            the end_time of the trade period, for slicing (so it may include more time at the end)
+        decision_list: List[Tuple[BaseTradeDecision, pd.Timestamp, pd.Timestamp]],
+            a list of decisions according to inner_order_indicators
         trade_exchange : Exchange
             for retrieving trading price
         pa_config : dict
@@ -362,32 +429,61 @@ class Indicator:
                 "price": "$close",  # TODO: this is not supported now!!!!!
                                     # default to use deal price of the exchange
             }
+
         """
 
-        agg = pa_config.get("agg", "twap").lower()
-        price = pa_config.get("price", "deal_price").lower()
+        # TODO: I think there are potentials to be optimized
+        trade_dir = self.order_indicator["trade_dir"]
+        if len(trade_dir) > 0:
+            bp_all, bv_all = [], []
+            # <step, inst, (base_volume | base_price)>
+            for oi, (dec, start, end) in zip(inner_order_indicators, decision_list):
+                bp_s = oi.get("base_price", pd.Series()).reindex(trade_dir.index)
+                bv_s = oi.get("base_volume", pd.Series()).reindex(trade_dir.index)
+                bp_new, bv_new = {}, {}
+                for pr, v, (inst, direction) in zip(bp_s.values, bv_s.values, trade_dir.items()):
+                    if np.isnan(pr):
+                        bp_new[inst], bv_new[inst] = self._get_base_vol_pri(
+                            inst,
+                            start,
+                            end,
+                            decision=dec,
+                            direction=direction,
+                            trade_exchange=trade_exchange,
+                            pa_config=pa_config,
+                        )
+                    else:
+                        bp_new[inst], bv_new[inst] = pr, v
 
-        base_price = {}
-        for inst, dir in self.order_indicator["trade_dir"].items():
+                bp_new, bv_new = pd.Series(bp_new), pd.Series(bv_new)
+                bp_all.append(bp_new)
+                bv_all.append(bv_new)
+            bp_all = pd.concat(bp_all, axis=1)
+            bv_all = pd.concat(bv_all, axis=1)
 
-            if price == "deal_price":
-                price_s = trade_exchange.get_deal_price(inst, trade_start_time, trade_end_time, dir, method=None)
-            else:
-                raise NotImplementedError(f"This type of input is not supported")
+            self.order_indicator["base_volume"] = bv_all.sum(axis=1)
+            self.order_indicator["base_price"] = (bp_all * bv_all).sum(axis=1) / self.order_indicator["base_volume"]
 
-            # there are some zeros in the trading price. These cases are known meaningless
-            price_s = price_s.mask(np.isclose(price_s, 0))
+    def _agg_order_price_advantage(self):
+        if not self.order_indicator["trade_price"].empty:
+            self.order_indicator["pa"] = self.order_indicator["trade_price"] / self.order_indicator["base_price"] - 1
+        else:
+            self.order_indicator["pa"] = pd.Series()
 
-            if agg == "vwap":
-                volume_s = trade_exchange.get_volume(inst, trade_start_time, trade_end_time, method=None)
-                base_price[inst] = ((price_s * volume_s).sum() / volume_s.sum()).item()
-            elif agg == "twap":
-                base_price[inst] = price_s.mean().item()
-
-        base_price = pd.Series(base_price)
-
-        # update PA
-        self.order_indicator["pa"] = self.order_indicator["trade_price"] / base_price - 1
+    def agg_order_indicators(
+        self,
+        inner_order_indicators: List[Dict[str, pd.Series]],
+        decision_list: List[Tuple[BaseTradeDecision, pd.Timestamp, pd.Timestamp]],
+        outer_trade_decision: BaseTradeDecision,
+        trade_exchange: Exchange,
+        indicator_config={},
+    ):
+        self._agg_order_trade_info(inner_order_indicators)
+        self._update_trade_amount(outer_trade_decision)
+        self._agg_order_fulfill_rate()
+        pa_config = indicator_config.get("pa_config", {})
+        self._agg_base_price(inner_order_indicators, decision_list, trade_exchange, pa_config=pa_config)
+        self._agg_order_price_advantage()
 
     def _cal_trade_fulfill_rate(self, method="mean"):
         if method == "mean":
@@ -402,7 +498,7 @@ class Indicator:
             raise ValueError(f"method {method} is not supported!")
 
     def _cal_trade_price_advantage(self, method="mean"):
-        pa_order = self.order_indicator["pa"] * (2 * (self.order_indicator["amount"] < 0).astype(int) - 1)
+        pa_order = self.order_indicator["pa"] * (1 - self.order_indicator["trade_dir"] * 2)
         if method == "mean":
             return pa_order.mean()
         elif method == "amount_weighted":
@@ -427,28 +523,6 @@ class Indicator:
     def _cal_trade_order_count(self):
         return self.order_indicator["amount"].count()
 
-    def update_order_indicators(self, trade_info: list):
-        self._update_order_trade_info(trade_info=trade_info)
-        self._update_order_fulfill_rate()
-        self._update_order_price_advantage()
-
-    def agg_order_indicators(
-        self,
-        trade_start_time,
-        trade_end_time,
-        inner_order_indicators: List[Dict[str, pd.Series]],
-        outer_trade_decision: BaseTradeDecision,
-        trade_exchange: Exchange,
-        indicator_config={},
-    ):
-        self._agg_order_trade_info(inner_order_indicators)
-        self._update_trade_amount(outer_trade_decision)
-        self._agg_order_fulfill_rate()
-        pa_config = indicator_config.get("pa_config", {})
-        self._agg_order_price_advantage(
-            inner_order_indicators, trade_start_time, trade_end_time, trade_exchange, pa_config=pa_config
-        )
-
     def cal_trade_indicators(self, trade_start_time, freq, indicator_config={}):
         show_indicator = indicator_config.get("show_indicator", False)
         ffr_config = indicator_config.get("ffr_config", {})
diff --git a/qlib/backtest/utils.py b/qlib/backtest/utils.py
index 0ba607bdb..5c643df30 100644
--- a/qlib/backtest/utils.py
+++ b/qlib/backtest/utils.py
@@ -1,9 +1,14 @@
 # Copyright (c) Microsoft Corporation.
 # Licensed under the MIT License.
+from __future__ import annotations
+from typing import Union, TYPE_CHECKING, Tuple, Union, List, Set
+
+if TYPE_CHECKING:
+    from qlib.backtest.order import BaseTradeDecision
+    from qlib.strategy.base import BaseStrategy
 
 import pandas as pd
 import warnings
-from typing import Tuple, Union, List, Set
 
 from ..utils.resam import get_resam_calendar
 from ..data.data import Cal
@@ -30,17 +35,20 @@ class TradeCalendarManager:
             closed end of the trade time range, by default None
             If `end_time` is None, it must be reset before trading.
         """
-        self.freq = freq
-        self.start_time = pd.Timestamp(start_time) if start_time else None
-        self.end_time = pd.Timestamp(end_time) if end_time else None
-        self._init_trade_calendar(freq=freq, start_time=start_time, end_time=end_time)
+        self.reset(freq=freq, start_time=start_time, end_time=end_time)
 
-    def _init_trade_calendar(self, freq, start_time, end_time):
+    def reset(self, freq, start_time, end_time):
         """
+        Please refer to the docs of `__init__`
+
         Reset the trade calendar
         - self.trade_len : The total count for trading step
         - self.trade_step : The number of trading step finished, self.trade_step can be [0, 1, 2, ..., self.trade_len - 1]
         """
+        self.freq = freq
+        self.start_time = pd.Timestamp(start_time) if start_time else None
+        self.end_time = pd.Timestamp(end_time) if end_time else None
+
         _calendar, freq, freq_sam = get_resam_calendar(freq=freq)
         self._calendar = _calendar
         _, _, _start_index, _end_index = Cal.locate_index(start_time, end_time, freq=freq, freq_sam=freq_sam)
@@ -67,6 +75,7 @@ class TradeCalendarManager:
         return self.freq
 
     def get_trade_len(self):
+        """get the total step length"""
         return self.trade_len
 
     def get_trade_step(self):
@@ -99,6 +108,12 @@ class TradeCalendarManager:
         calendar_index = self.start_index + trade_step
         return self._calendar[calendar_index], self._calendar[calendar_index + 1] - pd.Timedelta(seconds=1)
 
+    def get_cur_step_time(self):
+        """
+        get current step time
+        """
+        return self.get_step_time(self.get_trade_step())
+
     def get_all_time(self):
         """Get the start_time and end_time for trading"""
         return self.start_time, self.end_time
@@ -146,5 +161,40 @@ class CommonInfrastructure(BaseInfrastructure):
 
 
 class LevelInfrastructure(BaseInfrastructure):
+    """level instrastructure is created by executor, and then shared to strategies on the same level"""
+
     def get_support_infra(self):
-        return ["trade_calendar"]
+        return ["trade_calendar", "sub_level_infra"]
+
+    def reset_cal(self, freq, start_time, end_time):
+        """reset trade calendar manager"""
+        if self.has("trade_calendar"):
+            self.get("trade_calendar").reset(freq, start_time=start_time, end_time=end_time)
+        else:
+            self.reset_infra(trade_calendar=TradeCalendarManager(freq, start_time=start_time, end_time=end_time))
+
+    def set_sub_level_infra(self, sub_level_infra: LevelInfrastructure):
+        """this will make the calendar access easier when acrossing multi-levels"""
+        self.reset_infra(sub_level_infra=sub_level_infra)
+
+
+def get_start_end_idx(trade_calendar: TradeCalendarManager, outer_trade_decision: BaseTradeDecision) -> Union[int, int]:
+    """
+    A helper function for getting the decision-level index range limitation for inner strategy
+    - NOTE: this function is not applicable to order-level
+
+    Parameters
+    ----------
+    trade_calendar : TradeCalendarManager
+    outer_trade_decision : BaseTradeDecision
+        the trade decision made by outer strategy
+
+    Returns
+    -------
+    Union[int, int]:
+        start index and end index
+    """
+    try:
+        return outer_trade_decision.get_range_limit()
+    except NotImplementedError:
+        return 0, trade_calendar.get_trade_len() - 1
diff --git a/qlib/contrib/strategy/rule_strategy.py b/qlib/contrib/strategy/rule_strategy.py
index 3ca325bf6..026afc8bb 100644
--- a/qlib/contrib/strategy/rule_strategy.py
+++ b/qlib/contrib/strategy/rule_strategy.py
@@ -14,29 +14,7 @@ from ...backtest.order import BaseTradeDecision, Order, TradeDecisionWO
 from ...backtest.exchange import Exchange, OrderHelper
 from ...backtest.utils import CommonInfrastructure, LevelInfrastructure
 from qlib.utils.file import get_io_object
-
-
-def get_start_end_idx(strategy: BaseStrategy, outer_trade_decision: BaseTradeDecision) -> Union[int, int]:
-    """
-    A helper function for getting the decision-level index range limitation for inner strategy
-    - NOTE: this function is not applicable to order-level
-
-    Parameters
-    ----------
-    strategy : BaseStrategy
-        the inner strawtegy
-    outer_trade_decision : BaseTradeDecision
-        the trade decision made by outer strategy
-
-    Returns
-    -------
-    Union[int, int]:
-        start index and end index
-    """
-    try:
-        return outer_trade_decision.get_range_limit()
-    except NotImplementedError:
-        return 0, strategy.trade_calendar.get_trade_len() - 1
+from qlib.backtest.utils import get_start_end_idx
 
 
 class TWAPStrategy(BaseStrategy):
@@ -105,7 +83,7 @@ class TWAPStrategy(BaseStrategy):
         # get the number of trading step finished, trade_step can be [0, 1, 2, ..., trade_len - 1]
         trade_step = self.trade_calendar.get_trade_step()
         # get the total count of trading step
-        start_idx, end_idx = get_start_end_idx(self, self.outer_trade_decision)
+        start_idx, end_idx = get_start_end_idx(self.trade_calendar, self.outer_trade_decision)
         trade_len = end_idx - start_idx + 1
 
         if trade_step < start_idx or trade_step > end_idx:
diff --git a/qlib/strategy/base.py b/qlib/strategy/base.py
index a787c098f..23d6b520a 100644
--- a/qlib/strategy/base.py
+++ b/qlib/strategy/base.py
@@ -1,5 +1,6 @@
 # Copyright (c) Microsoft Corporation.
 # Licensed under the MIT License.
+from qlib.backtest.position import BasePosition
 from typing import List, Union
 
 from ..model.base import BaseModel
@@ -37,24 +38,26 @@ class BaseStrategy:
 
         self.reset(level_infra=level_infra, common_infra=common_infra, outer_trade_decision=outer_trade_decision)
 
+    @property
+    def trade_calendar(self) -> TradeCalendarManager:
+        return self.level_infra.get("trade_calendar")
+
+    @property
+    def trade_position(self) -> BasePosition:
+        return self.common_infra.get("trade_account").current
+
     def reset_level_infra(self, level_infra: LevelInfrastructure):
         if not hasattr(self, "level_infra"):
             self.level_infra = level_infra
         else:
             self.level_infra.update(level_infra)
 
-        if level_infra.has("trade_calendar"):
-            self.trade_calendar: TradeCalendarManager = level_infra.get("trade_calendar")
-
     def reset_common_infra(self, common_infra: CommonInfrastructure):
         if not hasattr(self, "common_infra"):
             self.common_infra: CommonInfrastructure = common_infra
         else:
             self.common_infra.update(common_infra)
 
-        if common_infra.has("trade_account"):
-            self.trade_position = common_infra.get("trade_account").current
-
     def reset(
         self,
         level_infra: LevelInfrastructure = None,