diff --git a/bi/vas_yoy_flow.py b/bi/vas_yoy_flow.py
index e3391bc..73498d3 100644
--- a/bi/vas_yoy_flow.py
+++ b/bi/vas_yoy_flow.py
@@ -18,7 +18,7 @@ class S:
 
     def get_last_ptime(self):
         sql = '''select * from vas_yoy_flow order by ptime desc limit 1'''
-        rows = self.mysql_db_vas.query(sql)
+        rows = self.mysql_db_bi.query(sql)
         if len(rows) > 0:
             return rows[0].get("ptime")
         return ""