diff --git a/vnpy/app/cta_strategy/backtesting.py b/vnpy/app/cta_strategy/backtesting.py
index b463a8c4..f901ef19 100644
--- a/vnpy/app/cta_strategy/backtesting.py
+++ b/vnpy/app/cta_strategy/backtesting.py
@@ -1163,6 +1163,7 @@ def load_tick_data(
         symbol, exchange, start, end
     )
 
+
 # GA related global value
 ga_end = None
 ga_mode = None