diff --git a/qlib/config.py b/qlib/config.py
index 4dedf75d0..15c13a015 100644
--- a/qlib/config.py
+++ b/qlib/config.py
@@ -195,7 +195,10 @@ MODE_CONF = {
         "timeout": 100,
         "logging_level": logging.INFO,
         "region": REG_CN,
-        ## Custom Operator
+        # custom operator
+        # each element of custom_ops should be Type[ExpressionOps] or dict
+        # if element of custom_ops is Type[ExpressionOps], it represents the custom operator class
+        # if element of custom_ops is dict, it represents the config of custom operator and should include `class` and `module_path` keys.
         "custom_ops": [],
     },
 }
diff --git a/qlib/data/ops.py b/qlib/data/ops.py
index cbc101f47..e044533d3 100644
--- a/qlib/data/ops.py
+++ b/qlib/data/ops.py
@@ -10,10 +10,12 @@ import abc
 import numpy as np
 import pandas as pd
 
+from typing import Union, List, Type
 from scipy.stats import percentileofscore
 
 from .base import Expression, ExpressionOps
 from ..log import get_module_logger
+from ..utils import get_cls_kwargs
 
 try:
     from ._libs.rolling import rolling_slope, rolling_rsquare, rolling_resi
@@ -1495,16 +1497,34 @@ class OpsWrapper:
     def reset(self):
         self._ops = {}
 
-    def register(self, ops_list):
-        for operator in ops_list:
-            if not issubclass(operator, ExpressionOps):
-                raise TypeError("operator must be subclass of ExpressionOps, not {}".format(operator))
+    def register(self, ops_list: List[Union[Type[ExpressionOps], dict]]):
+        """register operator
 
-            if operator.__name__ in self._ops:
+        Parameters
+        ----------
+        ops_list : List[Union[Type[ExpressionOps], dict]]
+            - if type(ops_list) is List[Type[ExpressionOps]], each element of ops_list represents the operator class, which should be the subclass of `ExpressionOps`.
+            - if type(ops_list) is List[dict], each element of ops_list represents the config of operator, which has the following format:
+                {
+                    "class": class_name,
+                    "module_path": path,
+                }
+                Note: `class` should be the class name of operator, `module_path` should be a python module or path of file.
+        """
+        for _operator in ops_list:
+            if isinstance(_operator, dict):
+                _ops_class, _ = get_cls_kwargs(_operator)
+            else:
+                _ops_class = _operator
+
+            if not issubclass(_ops_class, ExpressionOps):
+                raise TypeError("operator must be subclass of ExpressionOps, not {}".format(_ops_class))
+
+            if _ops_class.__name__ in self._ops:
                 get_module_logger(self.__class__.__name__).warning(
-                    "The custom operator [{}] will override the qlib default definition".format(operator.__name__)
+                    "The custom operator [{}] will override the qlib default definition".format(_ops_class.__name__)
                 )
-            self._ops[operator.__name__] = operator
+            self._ops[_ops_class.__name__] = _ops_class
 
     def __getattr__(self, key):
         if key not in self._ops: