diff --git a/.vscode/settings.json b/.vscode/settings.json
index 3e27229..492b582 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -6,6 +6,7 @@
         "unicstl.h": "c",
         "test.h": "c",
         "queue.h": "c",
-        "stdbool.h": "c"
+        "stdbool.h": "c",
+        "stdint.h": "c"
     }
 }
\ No newline at end of file
diff --git a/README.md b/README.md
index cf58a25..801489b 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,6 @@
 | **queue**   | | **队列**
 | queue_init  | 单向链表 | |
 | queue2_init | 数组 | FIFO/空/满 |
-| **deque**   | **双端队列** |
+| **deque**   | |**双端队列** |
 | deque_init  | 双向循环链表 | |
 
diff --git a/include/tree.h b/include/tree.h
index e2db10d..8ab8bcb 100644
--- a/include/tree.h
+++ b/include/tree.h
@@ -8,18 +8,18 @@
 
 typedef struct _tree_node_t
 {
-	tree_data_t data;
-	struct _tree_node_t * left;
-	struct _tree_node_t * right;
-	struct _tree_node_t * parent;
-	int32_t balance;		// balance of avl tree
+    tree_data_t data;
+    struct _tree_node_t * left;
+    struct _tree_node_t * right;
+    struct _tree_node_t * parent;
+    int32_t balance;		// balance of avl tree
 }tree_node_t, *ptree_node_t;
 
 
 typedef struct _tree_t
 {
-	struct _tree_node_t * tree;
-	uint32_t size;
+    struct _tree_node_t * tree;
+    uint32_t size;
 }tree_t, *ptree_t;
 
 typedef void (*tree_data_disp_t)(tree_data_t data);
@@ -28,42 +28,90 @@ typedef void (*tree_data_disp_t)(tree_data_t data);
 
 
 #if RAVLTREE == 1
-	bool tree_init(ptree_node_t *head);
-	void tree_destroy(ptree_node_t *head);
-	bool tree_empty(ptree_node_t head);
-	void tree_clear(ptree_node_t head);
-	uint32_t tree_get_size(ptree_node_t head);
+    bool tree_init(ptree_node_t *head);
+    void tree_destroy(ptree_node_t *head);
+    bool tree_empty(ptree_node_t head);
+    void tree_clear(ptree_node_t head);
+    uint32_t tree_get_size(ptree_node_t head);
 
-	bool tree_insert(ptree_node_t head, tree_data_t data);
-	bool tree_delete(ptree_node_t head, tree_data_t data);
-	bool tree_get_min(ptree_node_t head, tree_data_t *data);
-	bool tree_get_max(ptree_node_t head, tree_data_t *data);
+    bool tree_insert(ptree_node_t head, tree_data_t data);
+    bool tree_delete(ptree_node_t head, tree_data_t data);
+    bool tree_get_min(ptree_node_t head, tree_data_t *data);
+    bool tree_get_max(ptree_node_t head, tree_data_t *data);
 
-	void tree_traversal_depth_preorder(ptree_node_t head, tree_data_disp_t tree_data_disp);
-	void tree_traversal_depth_inorder(ptree_node_t head, tree_data_disp_t tree_data_disp);
-	//void tree_traversal_depth_postorder(ptree_node_t head, tree_data_disp_t tree_data_disp);
-	//void tree_traversal_breadth(ptree_node_t head, tree_data_disp_t tree_data_disp);
+    void tree_traversal_depth_preorder(ptree_node_t head, tree_data_disp_t tree_data_disp);
+    void tree_traversal_depth_inorder(ptree_node_t head, tree_data_disp_t tree_data_disp);
+    //void tree_traversal_depth_postorder(ptree_node_t head, tree_data_disp_t tree_data_disp);
+    //void tree_traversal_breadth(ptree_node_t head, tree_data_disp_t tree_data_disp);
 
 #endif
 
 #if AVLTREE == 1
-	bool tree_init(ptree_t *head);
-	void tree_destroy(ptree_t *head);
-	bool tree_empty(ptree_t head);
-	void tree_clear(ptree_t head);
-	uint32_t tree_get_size(ptree_t head);
+    bool tree_init(ptree_t *head);
+    void tree_destroy(ptree_t *head);
+    bool tree_empty(ptree_t head);
+    void tree_clear(ptree_t head);
+    uint32_t tree_get_size(ptree_t head);
 
-	bool tree_insert(ptree_t head, tree_data_t data);
-	bool tree_delete(ptree_t head, tree_data_t data);
-	bool tree_get_min(ptree_t head, tree_data_t *data);
-	bool tree_get_max(ptree_t head, tree_data_t *data);
+    bool tree_insert(ptree_t head, tree_data_t data);
+    bool tree_delete(ptree_t head, tree_data_t data);
+    bool tree_get_min(ptree_t head, tree_data_t *data);
+    bool tree_get_max(ptree_t head, tree_data_t *data);
 
-	void tree_traversal_depth_preorder(ptree_t head, tree_data_disp_t tree_data_disp);
-	void tree_traversal_depth_inorder(ptree_t head, tree_data_disp_t tree_data_disp);
-	void tree_traversal_depth_postorder(ptree_t head, tree_data_disp_t tree_data_disp);
-	void tree_traversal_breadth(ptree_t head, tree_data_disp_t tree_data_disp);
+    void tree_traversal_depth_preorder(ptree_t head, tree_data_disp_t tree_data_disp);
+    void tree_traversal_depth_inorder(ptree_t head, tree_data_disp_t tree_data_disp);
+    void tree_traversal_depth_postorder(ptree_t head, tree_data_disp_t tree_data_disp);
+    void tree_traversal_breadth(ptree_t head, tree_data_disp_t tree_data_disp);
 #endif
 
+struct _tree_node
+{
+    void *obj;
+    struct _tree_node * left;
+    struct _tree_node * right;
+    struct _tree_node * parent;
+
+    union 
+    {
+        uint32_t balance;
+        uint32_t color;
+    };
+};
+typedef struct _tree_node * tree_node_t;
+
+struct _tree
+{
+    struct _tree_node * _head;
+
+    uint32_t _size;				// 栈大小
+    uint32_t _obj_size;			// 元素大小
+    uint32_t _capacity;			// 总容量
+    uint32_t _ratio;			// 扩展比率
+
+    // kernel
+    bool (*insert)(struct _tree* self, void* obj);
+    bool (*delete)(struct _tree* self, void* obj);
+    bool (*peek)(struct _tree* self, void** obj);
+
+    bool (*clear)(struct _tree* self);
+    bool (*empty)(struct _tree* self);
+    uint32_t (*size)(struct _tree* self);
+
+    // compare
+    int (*compare)(void* obj1, void* obj2);
+
+    // free
+    void (*destory)(struct _tree* self);
+
+    // print
+    void (*print)(struct _tree* self);
+    void (*print_obj)(void* obj);
+};
+
+// bst_tree
+bool tree_avl_init(struct _tree *self, uint32_t obj_size);
+bool tree_rb_init(struct _tree *self, uint32_t obj_size);
+
 
 #endif // _TREE_H_
 
diff --git a/src/tree.c b/src/tree.c
index 8793f45..3b4882c 100644
--- a/src/tree.c
+++ b/src/tree.c
@@ -1392,3 +1392,128 @@ static bool tree_rebalance(ptree_t head, ptree_node_t tree)
 
 #endif
 
+
+static tree_node_t * tree_node_new(struct _tree* self, void* obj)
+{
+	void * obj_new = malloc(self->_obj_size);
+    if (obj_new == NULL)
+    {
+        goto done;
+    }
+    memmove(obj_new, obj, self->_obj_size);
+
+    struct _tree_node* node_new = (struct _queue_node*)malloc(sizeof(struct _tree_node));
+    if(node_new == NULL)
+    {
+		goto done;
+    }
+    node_new->obj = obj_new;
+	node_new->parent = NULL;
+	node_new->left = NULL;
+	node_new->right = NULL;
+	node_new->balance = 0;
+
+	return node_new;
+done:
+	if(obj_new != NULL)
+	{
+		free(obj_new);
+	}
+	if(node_new != NULL)
+    {
+        free(node_new);
+    }
+	return NULL;
+}
+
+static bool tree_node_free(struct _tree_node* node)
+{
+	assert(node != NULL);
+	if(node->obj != NULL)
+	{
+		free(node->obj);
+	}
+	free(node);
+	return true;
+}
+
+bool tree_avl_insert(struct _tree* self, void* obj)
+{
+	
+}
+
+bool tree_avl_delete(struct _tree* self, void* obj)
+{
+
+}
+
+bool tree_clear(struct _tree* self)
+{
+	assert(self != NULL);
+	return true;
+}
+
+bool tree_empty(struct _tree* self)
+{
+	assert(self != NULL);
+	return !self->size(self);
+}
+
+uint32_t tree_size(struct _tree* self)
+{
+	assert(self != NULL);
+	return self->size(self);
+}
+
+// free
+void tree_destory(struct _tree* self)
+{
+	assert(self != NULL);
+	self->clear(self);
+}
+
+// print
+void tree_print(struct _tree* self)
+{
+
+}
+
+void tree_print_obj(void* obj)
+{
+
+}
+
+bool tree_avl_init(struct _tree *self, uint32_t obj_size)
+{
+	assert(self != NULL);
+
+	self->_obj_size = obj_size;
+	self->_size = 0;
+	// self->_capacity = 64;
+	// self->_ratio = 2;
+
+	self->insert = tree_avl_insert;
+	self->delete = tree_avl_delete;
+	self->clear = tree_clear;
+	self->empty = tree_empty;
+	self->size = tree_size;
+	self->destory = tree_destory;
+	self->print = tree_print;
+
+	self->_head = (struct _tree_node *)malloc(sizeof(struct _tree_node));
+	if(self->_head == NULL)
+	{
+		return false;
+	}
+	self->_head->parent = NULL;
+	self->_head->left = NULL;
+	self->_head->right = NULL;
+	self->_head->balance = 0;
+
+	return true;
+}
+
+bool tree_rb_init(struct _tree *self, uint32_t obj_size)
+{
+
+}