diff --git a/TinySTL/Queue.h b/TinySTL/Queue.h
index 8a6b782..52a9b5c 100644
--- a/TinySTL/Queue.h
+++ b/TinySTL/Queue.h
@@ -12,7 +12,57 @@ namespace TinySTL{
 	//class of priority_queue
 	template <class T, class Container = TinySTL::vector<T>, 
 				class Compare = TinySTL::less<typename Container::value_type>> 
-	class priority_queue{};
+	class priority_queue{
+	public:
+		typedef T value_type;
+		typedef Container container_type;
+		typedef typename Container::reference reference;
+		typedef typename Container::const_reference const_reference;
+		typedef typename Container::size_type size_type;
+	private:
+		container_type container_;
+		Compare compare_;
+	public:
+		explicit priority_queue(const Compare& comp = Compare(),
+			const Container& ctnr = Container())
+			: container_(ctnr), compare_(comp){}
+		template <class InputIterator>
+		priority_queue(InputIterator first, InputIterator last,
+			const Compare& comp = Compare(),
+			const Container& ctnr = Container())
+			: container_(ctnr), compare_(comp){
+			container_.insert(container_.end(), first, last);
+			TinySTL::make_heap(container_.begin(), container_.end());
+		}
+		bool empty() const{
+			return container_.empty();
+		}
+		size_type size() const{
+			return container_.size();
+		}
+		reference top() {
+			return container_.front();
+		}
+		void push(const value_type& val){
+			container_.push_back(val);
+			TinySTL::push_heap(container_.begin(), container_.end(), compare_);
+		}
+		void pop(){
+			TinySTL::pop_heap(container_.begin(), container_.end(), compare_);
+			container_.pop_back();
+		}
+		void swap(priority_queue& x){
+			TinySTL::swap(container_, x.container_);
+			TinySTL::swap(compare_, x.compare_);
+		}
+	public:
+		template <class T, class Container, class Compare>
+		friend void swap(priority_queue<T, Container, Compare>& x, priority_queue<T, Container, Compare>& y);
+	};
+	template <class T, class Container, class Compare>
+	void swap(priority_queue<T, Container, Compare>& x, priority_queue<T, Container, Compare>& y){
+		x.swap(y);
+	}
 }
 
 #endif
\ No newline at end of file