diff --git a/qlib/backtest/__init__.py b/qlib/backtest/__init__.py
index 91eedd736..edfc907cd 100644
--- a/qlib/backtest/__init__.py
+++ b/qlib/backtest/__init__.py
@@ -8,7 +8,7 @@ from .backtest import backtest_loop
 from .backtest import collect_data_loop
 
 from .order import Order
-from .utils import CommonInfrastructure
+from .utils import CommonInfrastructure, TradeCalendarManager
 from ..strategy.base import BaseStrategy
 from ..utils import init_instance_by_config
 from ..log import get_module_logger