diff --git a/qlib/contrib/strategy/strategy.py b/qlib/contrib/strategy/strategy.py
index 4f8eb0ab1..74290b7d6 100644
--- a/qlib/contrib/strategy/strategy.py
+++ b/qlib/contrib/strategy/strategy.py
@@ -148,7 +148,6 @@ class WeightStrategyBase(BaseStrategy, AdjustTimer):
             pred score for this trade date, index is stock_id, contain 'score' column.
         current : Position()
             current position.
-        trade_exchange : Exchange()
         trade_date : pd.Timestamp
             trade date.
         """