diff --git a/apps/mosquito/tasks.py b/apps/mosquito/tasks.py
index c6b2bbc..4981508 100644
--- a/apps/mosquito/tasks.py
+++ b/apps/mosquito/tasks.py
@@ -69,11 +69,20 @@ def update_daily_statistic():
         _date_list.sort()
         is_first = True
         for d in _date_list:
+            obj = MosqPostStatistic.objects.get(date=d)
             if is_first:
-                history, created = MosqPostStatistic.objects.update_or_create(date=d, total=ret[d], increment=ret[d])
+                if obj:
+                    obj.total, obj.increment = ret[d], ret[d]
+                    obj.save()
+                else:
+                    MosqPostStatistic.objects.create(date=d, total=ret[d], increment=ret[d])
             else:
                 increment = ret[d] - ret[d-timedelta(days=1)]
-                history, created = MosqPostStatistic.objects.update_or_create(date=d, total=ret[d], increment=increment)
+                if obj:
+                    obj.total, obj.increment = ret[d], increment
+                    obj.save()
+                else:
+                    MosqPostStatistic.objects.create(date=d, total=ret[d], increment=increment)
             is_first = False
         return _date_list