diff --git a/api/api_v1/endpoints/query.py b/api/api_v1/endpoints/query.py
index 0da81d0..f8f6d04 100644
--- a/api/api_v1/endpoints/query.py
+++ b/api/api_v1/endpoints/query.py
@@ -268,8 +268,9 @@ async def event_model(
             #     q['proid_money'] = add_money
             res.append(q)
             continue
-
         if groupby and (set(groupby) & set(df)) == set(groupby):
+            columns = groupby[0]
+            df[columns] = df[columns].astype(str)
             # 有分组
             for group, df_group in df.groupby(groupby):
                 #在原数据上将索引重新转换为列，新索引的列删除