diff --git a/qlib/backtest/backtest.py b/qlib/backtest/backtest.py
index 82397abdb..81395dc73 100644
--- a/qlib/backtest/backtest.py
+++ b/qlib/backtest/backtest.py
@@ -10,6 +10,8 @@ from tqdm.auto import tqdm
 def backtest_loop(start_time, end_time, trade_strategy: BaseStrategy, trade_executor: BaseExecutor):
     """backtest funciton for the interaction of the outermost strategy and executor in the nested decision execution
 
+    please refer to the docs of `collect_data_loop`
+
     Returns
     -------
     report: Report
@@ -28,8 +30,11 @@ def collect_data_loop(start_time, end_time, trade_strategy: BaseStrategy, trade_
     ----------
     start_time : pd.Timestamp|str
         closed start time for backtest
+        **NOTE**: This will be applied to the outmost executor's calendar.
     end_time : pd.Timestamp|str
         closed end time for backtest
+        **NOTE**: This will be applied to the outmost executor's calendar.
+        E.g. Executor[day](Executor[1min]),   setting `end_time == 20XX0301` will include all the minutes on 20XX0301
     trade_strategy : BaseStrategy
         the outermost portfolio strategy
     trade_executor : BaseExecutor
diff --git a/qlib/backtest/executor.py b/qlib/backtest/executor.py
index b6d16d58f..3f7b2f4ed 100644
--- a/qlib/backtest/executor.py
+++ b/qlib/backtest/executor.py
@@ -3,6 +3,8 @@ import warnings
 import pandas as pd
 from typing import Union
 
+from qlib.backtest.report import Indicator
+
 from .order import Order, BaseTradeDecision
 from .exchange import Exchange
 from .utils import TradeCalendarManager, CommonInfrastructure, LevelInfrastructure
@@ -174,7 +176,7 @@ class BaseExecutor:
         else:
             raise ValueError("generate_report should be True if you want to generate report")
 
-    def get_trade_indicator(self):
+    def get_trade_indicator(self) -> Indicator:
         """get the trade indicator instance, which has pa/pos/ffr info."""
         return self.trade_account.indicator
 
@@ -279,7 +281,7 @@ class NestedExecutor(BaseExecutor):
                 trade_decision = updated_trade_decision
                 # NEW UPDATE
                 # create a hook for inner strategy to update outter decision
-                self.inner_strategy.alter_decision(trade_decision)
+                self.inner_strategy.alter_outer_trade_decision(trade_decision)
 
             _inner_trade_decision = self.inner_strategy.generate_trade_decision(_inner_execute_result)
 
@@ -287,7 +289,7 @@ class NestedExecutor(BaseExecutor):
             _inner_execute_result = yield from self.inner_executor.collect_data(trade_decision=_inner_trade_decision)
 
             execute_result.extend(_inner_execute_result)
-            inner_order_indicators.append(self.inner_executor.get_trade_indicator().get_order_indicator)
+            inner_order_indicators.append(self.inner_executor.get_trade_indicator().get_order_indicator())
 
         if hasattr(self, "trade_account"):
             trade_step = self.trade_calendar.get_trade_step()
diff --git a/qlib/backtest/order.py b/qlib/backtest/order.py
index d1b5f6d08..6324a9be9 100644
--- a/qlib/backtest/order.py
+++ b/qlib/backtest/order.py
@@ -56,7 +56,7 @@ class BaseTradeDecision:
         2. After a period of time, the decision are updated and become available
         3. The inner strategy try to get the decision and start to execute the decision according to `get_range_limit`
         Case 2:
-        1. The strategy is available at the start of the interval
+        1. The outer strategy's decision is available at the start of the interval
         2. Same as `case 1.3`
     """
     def __init__(self, strategy: BaseStrategy):
@@ -133,14 +133,19 @@ class TradeDecisionWO(BaseTradeDecision):
     def get_range_limit(self) -> Tuple[int, int]:
         if self.idx_range is None:
             # Default to get full index
-            return 0, self.strategy.trade_calendar.get_trade_len() - 1
+            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
 
+    def __repr__(self) -> str:
+        return f"strategy: {self.strategy}; idx_range: {self.idx_range}; order_list[{len(self.order_list)}]"
+
 
 # TODO: the orders below need to be discussed ------------------------------------
+# - The classes below are designed for Case 1
+# - However, Case 1 can't take `order_pool` as the an argument as the constructor function
 class TradeDecisionWithOrderPool:
     """trade decision that made by strategy"""
 
diff --git a/qlib/backtest/report.py b/qlib/backtest/report.py
index 70ebd724e..3f2649839 100644
--- a/qlib/backtest/report.py
+++ b/qlib/backtest/report.py
@@ -395,11 +395,9 @@ class Indicator:
                 )
             )
 
-    @property
     def get_order_indicator(self):
         return self.order_indicator
 
-    @property
     def get_trade_indicator(self):
         return self.trade_indicator
 
diff --git a/qlib/backtest/utils.py b/qlib/backtest/utils.py
index d2441dd3a..720eb627e 100644
--- a/qlib/backtest/utils.py
+++ b/qlib/backtest/utils.py
@@ -103,6 +103,9 @@ class TradeCalendarManager:
         """Get the start_time and end_time for trading"""
         return self.start_time, self.end_time
 
+    def __repr__(self) -> str:
+        return f"{self.start_time}[{self.start_index}]~{self.end_time}[{self.end_index}]: [{self.trade_step}/{self.trade_len}]"
+
 
 class BaseInfrastructure:
     def __init__(self, **kwargs):
diff --git a/qlib/contrib/strategy/model_strategy.py b/qlib/contrib/strategy/model_strategy.py
index 14e6f0810..2e72cb32c 100644
--- a/qlib/contrib/strategy/model_strategy.py
+++ b/qlib/contrib/strategy/model_strategy.py
@@ -6,12 +6,15 @@ import pandas as pd
 
 from ...utils.resam import resam_ts_data
 from ...strategy.base import ModelStrategy
-from ...backtest.order import Order, BaseTradeDecision
+from ...backtest.order import Order, BaseTradeDecision, TradeDecisionWO
 
 from .order_generator import OrderGenWInteract
 
 
 class TopkDropoutStrategy(ModelStrategy):
+    # TODO:
+    # 1. Supporting leverage the get_range_limit result from the decision
+    # 2. Supporting alter_outer_trade_decision
     def __init__(
         self,
         model,
@@ -246,10 +249,13 @@ class TopkDropoutStrategy(ModelStrategy):
                 factor=factor,
             )
             buy_order_list.append(buy_order)
-        return TradeDecision(order_list=sell_order_list + buy_order_list, ori_strategy=self)
+        return TradeDecisionWO(sell_order_list + buy_order_list, self)
 
 
 class WeightStrategyBase(ModelStrategy):
+    # TODO:
+    # 1. Supporting leverage the get_range_limit result from the decision
+    # 2. Supporting alter_outer_trade_decision
     def __init__(
         self,
         model,
@@ -343,4 +349,4 @@ class WeightStrategyBase(ModelStrategy):
             trade_start_time=trade_start_time,
             trade_end_time=trade_end_time,
         )
-        return TradeDecision(order_list=order_list, ori_strategy=self)
+        return TradeDecisionWO(order_list, self)
diff --git a/qlib/contrib/strategy/order_generator.py b/qlib/contrib/strategy/order_generator.py
index f822609c8..c1be982cc 100644
--- a/qlib/contrib/strategy/order_generator.py
+++ b/qlib/contrib/strategy/order_generator.py
@@ -6,7 +6,7 @@ This order generator is for strategies based on WeightStrategyBase
 """
 from ...backtest.position import Position
 from ...backtest.exchange import Exchange
-from ...backtest.order import BaseTradeDecision
+from ...backtest.order import BaseTradeDecision, TradeDecisionWO
 
 import pandas as pd
 import copy
@@ -127,7 +127,7 @@ class OrderGenWInteract(OrderGenerator):
             trade_start_time=trade_start_time,
             trade_end_time=trade_end_time,
         )
-        return TradeDecision(order_list=order_list, ori_strategy=self)
+        return TradeDecisionWO(order_list, self)
 
 
 class OrderGenWOInteract(OrderGenerator):
@@ -191,4 +191,4 @@ class OrderGenWOInteract(OrderGenerator):
             trade_start_time=trade_start_time,
             trade_end_time=trade_end_time,
         )
-        return TradeDecision(order_list=order_list, ori_strategy=self)
+        return TradeDecisionWO(order_list, self)
diff --git a/qlib/contrib/strategy/rule_strategy.py b/qlib/contrib/strategy/rule_strategy.py
index 9c024276a..b8a900b85 100644
--- a/qlib/contrib/strategy/rule_strategy.py
+++ b/qlib/contrib/strategy/rule_strategy.py
@@ -12,6 +12,29 @@ from ...backtest.exchange import Exchange
 from ...backtest.utils import CommonInfrastructure, LevelInfrastructure
 
 
+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
+
+
 class TWAPStrategy(BaseStrategy):
     """TWAP Strategy for trading"""
 
@@ -78,7 +101,7 @@ 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 = self.outer_trade_decision.get_range_limit()
+        start_idx, end_idx = get_start_end_idx(self, self.outer_trade_decision)
         trade_len = end_idx - start_idx  + 1
 
         if trade_step < start_idx:
@@ -147,6 +170,10 @@ class SBBStrategyBase(BaseStrategy):
     TREND_SHORT = 1
     TREND_LONG = 2
 
+    # TODO:
+    # 1. Supporting leverage the get_range_limit result from the decision
+    # 2. Supporting alter_outer_trade_decision
+
     def __init__(
         self,
         outer_trade_decision: BaseTradeDecision = None,
@@ -345,13 +372,16 @@ class SBBStrategyBase(BaseStrategy):
                 # in the first one of two adjacent bars, store the trend for the second one to use
                 self.trade_trend[order.stock_id] = _pred_trend
 
-        return TradeDecision(order_list=order_list, ori_strategy=self)
+        return TradeDecisionWO(order_list, self)
 
 
 class SBBStrategyEMA(SBBStrategyBase):
     """
     (S)elect the (B)etter one among every two adjacent trading (B)ars to sell or buy with (EMA) signal.
     """
+    # TODO:
+    # 1. Supporting leverage the get_range_limit result from the decision
+    # 2. Supporting alter_outer_trade_decision
 
     def __init__(
         self,
@@ -430,6 +460,9 @@ class SBBStrategyEMA(SBBStrategyBase):
 
 
 class ACStrategy(BaseStrategy):
+    # TODO:
+    # 1. Supporting leverage the get_range_limit result from the decision
+    # 2. Supporting alter_outer_trade_decision
     def __init__(
         self,
         lamb: float = 1e-6,
@@ -601,7 +634,7 @@ class ACStrategy(BaseStrategy):
                     factor=order.factor,
                 )
                 order_list.append(_order)
-        return TradeDecision(order_list=order_list, ori_strategy=self)
+        return TradeDecisionWO(order_list, self)
 
 
 class RandomOrderStrategy(BaseStrategy):
@@ -655,4 +688,4 @@ class RandomOrderStrategy(BaseStrategy):
                             end_time=step_time_end,
                             direction=direction,  # 1 for buy
                         ))
-        return TradeDecisionWO(order_list, self)
+        return TradeDecisionWO(order_list, self, self.index_range)
diff --git a/qlib/strategy/base.py b/qlib/strategy/base.py
index b20b0db66..734d25721 100644
--- a/qlib/strategy/base.py
+++ b/qlib/strategy/base.py
@@ -113,10 +113,9 @@ class BaseStrategy:
         outer_trade_decision : BaseTradeDecision
             the decision updated by the outer strategy
         """
-
         # default to reset the decision directly
         # NOTE: normally, user should do something to the strategy due to the change of outer decision
-        self.outer_trade_decision = outer_trade_decision
+        raise NotImplementedError(f"Please implement the `alter_outer_trade_decision` method")
 
 
 class ModelStrategy(BaseStrategy):