diff --git a/CMakelists.txt b/CMakelists.txt
index c1f602d..c952eb2 100644
--- a/CMakelists.txt
+++ b/CMakelists.txt
@@ -1,6 +1,6 @@
 
 # 0. cmake 最低版本号要求
-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.28)
 
 # 0. 项目信息
 project(demo)
diff --git a/mk.bat b/mk.bat
index 9f1b0f1..367c0f1 100644
--- a/mk.bat
+++ b/mk.bat
@@ -1,7 +1,8 @@
 @REM D:\Lang\cmake-3.27.5-windows-x86_64\bin\cmake.EXE --no-warn-unused-cli -DCMAKE_BUILD_TYPE:STRING=Debug -DCMAKE_EXPORT_COMPILE_COMMANDS:BOOL=TRUE -DCMAKE_C_COMPILER:FILEPATH=D:\Software\mingw64\bin\gcc.exe -DCMAKE_CXX_COMPILER:FILEPATH=D:\Software\mingw64\bin\g++.exe -SF:/OpenDemo/1_vsc_cmake -Bf:/OpenDemo/1_vsc_cmake/build -G "MinGW Makefiles"
 @REM cmake -Bbuild -G "Visual Studio 17 2022"
 
-cmake -B build -G "MinGW Makefiles"
+@REM cmake -B build -G "MinGW Makefiles"
+cmake -B build -G "Unix Makefiles"
 
 make -C build
 make -C build install 
diff --git a/src/tree.c b/src/tree.c
index ab5f17d..de323d6 100644
--- a/src/tree.c
+++ b/src/tree.c
@@ -1496,10 +1496,10 @@ static void tree_set_balance(struct _tree* self, struct _tree_node * node)
  * 
  * | 情况 | root->balance | node->balance | 调整方式 |
  * | ---- | ------------ | -------------- | -------- |
- * | 1    | > 0          | > 0            | 左旋
- * | 2    | > 0          | < 0            | 先右旋后左旋
- * | 3    | < 0          | < 0            | 右旋
- * | 4    | < 0          | > 0            | 先右旋后左旋
+ * | 1    | > 1          | > 0            | 左旋
+ * | 2    | > 1          | < 0            | 先右旋后左旋
+ * | 3    | < -1         | < 0            | 右旋
+ * | 4    | < -1         | > 0            | 先右旋后左旋
  * 
  * @param self 
  * @return true 
@@ -1508,13 +1508,14 @@ static void tree_set_balance(struct _tree* self, struct _tree_node * node)
 static bool tree_avl_rebalance(struct _tree* self, struct _tree_node* root)
 {
     assert(self != NULL);
-    if((root == NULL) || (root->left == NULL) || (root->right == NULL))
+    if(root == NULL)
     {
         return true;
     }
 
+    tree_set_balance(self, root);
     int balance = root->balance;
-    if(balance > 0)
+    if(balance > 1)
     {
         if(root->right->balance > 0)
         {
@@ -1525,7 +1526,7 @@ static bool tree_avl_rebalance(struct _tree* self, struct _tree_node* root)
             root = tree_trun_left_then_right(self, root);
         }
     }
-    else if(balance < 0)
+    else if(balance < 1)
     {
         if(root->left->balance < 0)
         {
@@ -1537,7 +1538,10 @@ static bool tree_avl_rebalance(struct _tree* self, struct _tree_node* root)
         }
     }
 
-    tree_set_balance(self, root);
+    if(root->parent != NULL)
+    {
+        tree_avl_rebalance(self, root->parent);
+    }
     return true;
 }
 
@@ -1665,6 +1669,7 @@ bool tree_avl_insert(struct _tree* self, void* obj)
             tree_node_free(node);
             return false;
         }
+        self->rebalance(self, root);
     }
 
     self->_size++;