diff --git a/docs/uniCloud/cf-database-aggregate-operator.md b/docs/uniCloud/cf-database-aggregate-operator.md
index 74b0df1eb07d96109e4630620a45e7926fbf79a7..455ac2bae79395818709d35b47ab7908fd34b978 100644
--- a/docs/uniCloud/cf-database-aggregate-operator.md
+++ b/docs/uniCloud/cf-database-aggregate-operator.md
@@ -1055,8 +1055,8 @@ let res = await db.collection('stats').aggregate()
 
  
 ```js
-{ "_id": 1, "index": 160 }
-{ "_id": 2, "index": 100 }
+{ "_id": 1, "sum": 160 }
+{ "_id": 2, "sum": 100 }
 ```
 
 ### map