diff --git a/Parent-Child-Relationship-Query.md b/Parent-Child-Relationship-Query.md
index 47d8046..78445d8 100644
--- a/Parent-Child-Relationship-Query.md
+++ b/Parent-Child-Relationship-Query.md
@@ -37,7 +37,7 @@ fsql.Select<Area>().Where(a => a.Parent.Parent.Parent.Name == "中国").First();
 Define the Childs attribute, in the expression (subquery):
 
 ```csharp
-fsql.Select<Area>().Where(a => a.Childs.AsSelect().Any(c => c.Name == "北京")).First();
+fsql.Select<Area>().Where(a => a.Childs.Any(c => c.Name == "北京")).First();
 ```
 
 To define the Childs property, you can also use [Cascade Saving](Cascade-Saving), [Greed Loading](Greed-Loading) and so on.