diff --git a/plusone-system/plusone-system-application/src/main/java/xyz/zhouxy/plusone/system/application/query/result/MenuViewObject.java b/plusone-system/plusone-system-application/src/main/java/xyz/zhouxy/plusone/system/application/query/result/MenuViewObject.java
index 1870391..c2fdd6d 100644
--- a/plusone-system/plusone-system-application/src/main/java/xyz/zhouxy/plusone/system/application/query/result/MenuViewObject.java
+++ b/plusone-system/plusone-system-application/src/main/java/xyz/zhouxy/plusone/system/application/query/result/MenuViewObject.java
@@ -2,9 +2,10 @@ package xyz.zhouxy.plusone.system.application.query.result;
 
 import java.util.ArrayList;
 import java.util.Collection;
-import java.util.Comparator;
+import java.util.Collections;
 import java.util.List;
-import java.util.Objects;
+import java.util.SortedSet;
+import java.util.TreeSet;
 
 import com.fasterxml.jackson.annotation.JsonInclude;
 
@@ -81,18 +82,18 @@ public class MenuViewObject implements IWithOrderNumber {
     List<Action> actions;
 
     // MENU_LIST
-    List<MenuViewObject> children;
+    SortedSet<MenuViewObject> children;
 
     public void addChild(MenuViewObject child) {
         if (this.children == null) {
-            this.children = new ArrayList<>();
+            this.children = new TreeSet<>();
         }
         this.children.add(child);
     }
 
     public void addChildren(Collection<MenuViewObject> children) {
         if (this.children == null) {
-            this.children = new ArrayList<>();
+            this.children = new TreeSet<>();
         }
         this.children.addAll(children);
     }
@@ -121,11 +122,33 @@ public class MenuViewObject implements IWithOrderNumber {
     }
 
     public List<MenuViewObject> getChildren() {
-        return Objects.nonNull(this.children)
-                ? this.children
-                        .stream()
-                        .sorted(Comparator.comparing(IWithOrderNumber::getOrderNumber))
-                        .toList()
-                : null;
+        return this.children == null || this.children.isEmpty()
+                ? Collections.emptyList()
+                : new ArrayList<>(this.children);
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((id == null) ? 0 : id.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        MenuViewObject other = (MenuViewObject) obj;
+        if (id == null) {
+            if (other.id != null)
+                return false;
+        } else if (!id.equals(other.id))
+            return false;
+        return true;
     }
 }