diff --git a/problems/周总结/20201003二叉树周末总结.md b/problems/周总结/20201003二叉树周末总结.md
index b7c123bc..0cb8b654 100644
--- a/problems/周总结/20201003二叉树周末总结.md
+++ b/problems/周总结/20201003二叉树周末总结.md
@@ -40,9 +40,8 @@ public:
         return isSame;
 
     }
-    bool isSymmetric(TreeNode* root) {
-        if (root == NULL) return true;
-        return compare(root->left, root->right);
+    bool isSymmetric(TreeNode* p, TreeNode* q) {
+        return compare(p, q);
     }
 };
 ```