diff --git a/apps/wpm/tasks.py b/apps/wpm/tasks.py
index 39f1087f..6573c45d 100644
--- a/apps/wpm/tasks.py
+++ b/apps/wpm/tasks.py
@@ -58,7 +58,7 @@ def get_total_hour_now(sflogId: str=''):
 
 
 @shared_task(base=CustomTask)
-def cal_exp_duration_hour(stlogId: str, all=False):
+def cal_exp_duration_hour(stlogId: str='', all=False):
     """
     计算异常记录对应的每班持续时间
     """