diff --git a/TinySTL/Detail/Graph.impl.h b/TinySTL/Detail/Graph.impl.h
index db65679..5b674cb 100644
--- a/TinySTL/Detail/Graph.impl.h
+++ b/TinySTL/Detail/Graph.impl.h
@@ -3,16 +3,9 @@
 namespace TinySTL{
 	namespace Detail{
 		template<class Index, class Value, class EqualFunc>
-		typename graph<Index, Value, EqualFunc>::node_type&
-			graph<Index, Value, EqualFunc>::new_node(const Index& index, const Value& val){
-			auto ptr = nodeAllocator::allocate();
-			nodeAllocator::construct(ptr, node_type(index, val));
-			return *ptr;
-		}
-		template<class Index, class Value, class EqualFunc>
-		void graph<Index, Value, EqualFunc>::del_node(node_type *p){
-			nodeAllocator::destroy(p);
-			nodeAllocator::deallocate(p);
+		typename graph<Index, Value, EqualFunc>::node_type
+			graph<Index, Value, EqualFunc>::make_node(const Index& index, const Value& val){
+			return node_type(index, val);
 		}
 		template<class Index, class Value, class EqualFunc>
 		typename graph<Index, Value, EqualFunc>::node_type& 
@@ -24,14 +17,6 @@ namespace TinySTL{
 			return node_type();
 		}
 		template<class Index, class Value, class EqualFunc>
-		void graph<Index, Value, EqualFunc>::cleanup(){
-			for (auto out = nodes_.begin(); out != nodes_.end(); ++out){
-				for (auto in = (out->second).begin(); in != (out->second).end(); ++in){
-					del_node(&(*in));
-				}
-			}
-		}
-		template<class Index, class Value, class EqualFunc>
 		bool graph<Index, Value, EqualFunc>::is_contained(const Index& index){
 			for (auto& pair : nodes_){
 				if (equal_func(pair.first.first, index))
@@ -64,7 +49,6 @@ namespace TinySTL{
 				if (equal_func(pair.first.first, index))
 					return inner_iterator(this, (pair.second).end());
 			}
-			//throw std::exception("return end error");
 			return inner_iterator();
 		}
 		template<class Index, class Value, class EqualFunc>
@@ -231,19 +215,13 @@ namespace TinySTL{
 		for (auto oit = nodes_.begin(); oit != nodes_.end();){
 			auto& l = oit->second;
 			if (equal_func((oit->first).first, index)){
-				for (auto iit = l.begin(); iit != l.end(); ++iit){
-					del_node(&(*iit));
-				}
-				del_node(&(oit->first));
 				oit = nodes_.erase(oit);
 			}else{
 				for (auto iit = l.begin(); iit != l.end();){
-					if (equal_func(iit->first, index)){
-						del_node(&(*iit));
+					if (equal_func(iit->first, index))
 						iit = l.erase(iit);
-					}else{
+					else
 						++iit;
-					}
 				}
 				++oit;
 			}
diff --git a/TinySTL/Graph.h b/TinySTL/Graph.h
index 76cb798..fafdadb 100644
--- a/TinySTL/Graph.h
+++ b/TinySTL/Graph.h
@@ -1,7 +1,6 @@
 #ifndef _GRAPH_H_
 #define _GRAPH_H_
 
-#include "Allocator.h"
 #include "Iterator.h"
 #include "List.h"
 #include "String.h"
@@ -31,13 +30,12 @@ namespace TinySTL{
 			typedef EqualFunc equal_func_type;
 			typedef pair<Index, Value> node_type;
 			typedef vector<node_type> nodes_set_type;
-			typedef allocator<node_type> nodeAllocator;
 			typedef std::function<void(node_type&)> visiter_func_type;
 			typedef outter_iterator<Index, Value, EqualFunc> iterator;
 			typedef inner_iterator<Index, Value, EqualFunc> inner_iterator;
 		public:
 			graph() :size_(0){};
-			virtual ~graph(){ cleanup(); };
+			virtual ~graph(){};
 
 			//node can be not in the graph
 			virtual void add_node(const node_type& item, const nodes_set_type& nodes) = 0;
@@ -50,8 +48,8 @@ namespace TinySTL{
 			void DFS(const Index& index, visiter_func_type func);
 			void BFS(const Index& index, visiter_func_type func);
 
-			node_type& new_node(const Index& index, const Value& val);
-			void del_node(node_type *p);
+			//node_type& new_node(const Index& index, const Value& val);
+			node_type make_node(const Index& index, const Value& val);
 			node_type& get_node(const Index& index);
 
 			bool is_contained(const Index& index);
@@ -72,8 +70,6 @@ namespace TinySTL{
 			list<pair<node_type, list<node_type>>> nodes_;
 			equal_func_type equal_func;
 			size_t size_;
-		protected:
-			void cleanup();
 		};
 
 		template<class Index, class Value, class EqualFunc = equal_to<Index>>