diff --git a/qlib/log.py b/qlib/log.py
index d095d571a..e714bc15a 100644
--- a/qlib/log.py
+++ b/qlib/log.py
@@ -18,7 +18,6 @@ class MetaLogger(type):
         for key in wrapper_dict:
             if key not in dict and key != "__reduce__":
                 dict[key] = wrapper_dict[key]
-        dict["__doc__"] = logging.Logger.__doc__
         return type.__new__(cls, name, bases, dict)
 
 
@@ -31,9 +30,6 @@ class QlibLogger(metaclass=MetaLogger):
         self.module_name = module_name
         self.level = 0
 
-    def __reduce__(self):
-        return (QlibLogger, (self.module_name,))
-
     @property
     def logger(self):
         logger = logging.getLogger(self.module_name)