diff --git a/TinySTL/AVLTree.h b/TinySTL/AVLTree.h
new file mode 100644
index 0000000..3912e6e
--- /dev/null
+++ b/TinySTL/AVLTree.h
@@ -0,0 +1,40 @@
+#ifndef _AVL_TREE_H_
+#define _AVL_TREE_H_
+
+#include "Allocator.h"
+
+namespace TinySTL{
+	//class of avl tree
+	template<class T>
+	class avl_tree{
+	public:
+		typename T value_type;
+	private:
+		struct node{
+			T data_;
+			node *left_, *right_;
+			size_t height_;
+			explicit node(T d = T(), node *l = 0, node *r = 0, size_t h = 0)
+				:data_(d), left_(l), right_(r), height_(h){}
+		};
+		typedef TinySTL::allocator<T> dataAllocator;
+	private:
+		node *root_;
+	public:
+		avl_tree() :root_(0){}
+		avl_tree(const avl_tree&) = delete;
+		avl_tree& operator = (const avl_tree&) = delete;
+		~avl_tree(){ destroyAndDeallocateAllNodes(root_); }
+	private:
+		void destroyAndDeallocateAllNodes(node *p){
+			if (p != 0){
+				destroyAndDeallocateAllNodes(p->left_);
+				destroyAndDeallocateAllNodes(p->right_);
+				dataAllocator::destroy(p);
+				dataAllocator::deallocate(p);
+			}
+		}
+	};
+}
+
+#endif
\ No newline at end of file
diff --git a/TinySTL/TinySTL.vcxproj b/TinySTL/TinySTL.vcxproj
index d42101c..fd62738 100644
--- a/TinySTL/TinySTL.vcxproj
+++ b/TinySTL/TinySTL.vcxproj
@@ -86,6 +86,7 @@
     <ClInclude Include="Algorithm.h" />
     <ClInclude Include="Alloc.h" />
     <ClInclude Include="Allocator.h" />
+    <ClInclude Include="AVLTree.h" />
     <ClInclude Include="BinarySearchTree.h" />
     <ClInclude Include="Bitmap.h" />
     <ClInclude Include="CircularBuffer.h" />
diff --git a/TinySTL/TinySTL.vcxproj.filters b/TinySTL/TinySTL.vcxproj.filters
index ce861fc..57f3834 100644
--- a/TinySTL/TinySTL.vcxproj.filters
+++ b/TinySTL/TinySTL.vcxproj.filters
@@ -83,5 +83,8 @@
     <ClInclude Include="BinarySearchTree.h">
       <Filter>头文件</Filter>
     </ClInclude>
+    <ClInclude Include="AVLTree.h">
+      <Filter>头文件</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>
\ No newline at end of file