diff --git a/vnpy/app/cta_strategy/backtesting.py b/vnpy/app/cta_strategy/backtesting.py
index 45a1c48e..fa7a725e 100644
--- a/vnpy/app/cta_strategy/backtesting.py
+++ b/vnpy/app/cta_strategy/backtesting.py
@@ -1189,7 +1189,7 @@ def ga_optimize(parameter_values: list):
     return _ga_optimize(tuple(parameter_values))
 
 
-@lru_cache(maxsize=10)
+@lru_cache(maxsize=999)
 def load_bar_data(
     symbol: str,
     exchange: Exchange,
@@ -1203,7 +1203,7 @@ def load_bar_data(
     )
 
 
-@lru_cache(maxsize=10)
+@lru_cache(maxsize=999)
 def load_tick_data(
     symbol: str,
     exchange: Exchange,