diff --git a/TinySTL/Detail/Unordered_set.impl.h b/TinySTL/Detail/Unordered_set.impl.h
index 2bda7f0..1ba76e5 100644
--- a/TinySTL/Detail/Unordered_set.impl.h
+++ b/TinySTL/Detail/Unordered_set.impl.h
@@ -4,6 +4,53 @@
 #include <functional>
 
 namespace TinySTL{
+	namespace Detail{
+		template<class Key, class ListIterator, class Hash, class KeyEqual, class Allocator>
+		ust_iterator<Key, ListIterator, Hash, KeyEqual, Allocator>::ust_iterator(size_t index, ListIterator it, cntrPtr ptr)
+			:bucket_index_(index), iterator_(it), container_(ptr){}
+		template<class Key, class ListIterator, class Hash, class KeyEqual, class Allocator>
+		ust_iterator<Key, ListIterator, Hash, KeyEqual, Allocator>&
+			ust_iterator<Key, ListIterator, Hash, KeyEqual, Allocator>::operator ++(){
+			++iterator_;
+			//如果前进一位后到达了list的末尾，则需要跳转到下一个有item的bucket的list
+			if (iterator_ == container_->buckets_[bucket_index_].end()){
+				for (;;){
+					if (bucket_index_ == container_->buckets_.size() - 1){
+						*this = container_->end();
+						break;
+					}
+					else{
+						++bucket_index_;
+						if (!(container_->buckets_[bucket_index_].empty())){//此list不为空
+							iterator_ = container_->buckets_[bucket_index_].begin();
+							break;
+						}
+					}
+				}
+			}
+			return *this;
+		}
+		template<class Key, class ListIterator, class Hash, class KeyEqual, class Allocator>
+		ust_iterator<Key, ListIterator, Hash, KeyEqual, Allocator>
+			ust_iterator<Key, ListIterator, Hash, KeyEqual, Allocator>::operator ++(int){
+			auto res = *this;
+			++*this;
+			return res;
+		}
+		template<class Key, class ListIterator, class Hash, class KeyEqual, class Allocator>
+		bool operator ==(const ust_iterator<Key, ListIterator, Hash, KeyEqual, Allocator>& lhs,
+			const ust_iterator<Key, ListIterator, Hash, KeyEqual, Allocator>& rhs){
+			return lhs.bucket_index_ == rhs.bucket_index_ &&
+				lhs.iterator_ == rhs.iterator_ &&
+				lhs.container_ == rhs.container_;
+		}
+		template<class Key, class ListIterator, class Hash, class KeyEqual, class Allocator>
+		bool operator !=(const ust_iterator<Key, ListIterator, Hash, KeyEqual, Allocator>& lhs,
+			const ust_iterator<Key, ListIterator, Hash, KeyEqual, Allocator>& rhs){
+			return !(lhs == rhs);
+		}
+	}//end of Detail namespace
+
 	template<class Key, class Hash, class KeyEqual, class Allocator>
 	typename Unordered_set<Key, Hash, KeyEqual, Allocator>::size_type 
 		Unordered_set<Key, Hash, KeyEqual, Allocator>::size()const{ 
@@ -78,6 +125,18 @@ namespace TinySTL{
 		return prime_list_[i];
 	}
 	template<class Key, class Hash, class KeyEqual, class Allocator>
+	Unordered_set<Key, Hash, KeyEqual, Allocator>::Unordered_set(const Unordered_set& ust){
+		buckets_ = ust.buckets_;
+		size_ = ust.size_;
+	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	Unordered_set<Key, Hash, KeyEqual, Allocator>& Unordered_set<Key, Hash, KeyEqual, Allocator>::operator = (const Unordered_set& ust){
+		if (this != &ust){
+			buckets_ = ust.buckets_;
+			size_ = ust.size_;
+		}
+	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
 	Unordered_set<Key, Hash, KeyEqual, Allocator>::Unordered_set(size_type bucket_count){
 		bucket_count = next_prime(bucket_count);
 		buckets_.resize(bucket_count);
@@ -97,6 +156,23 @@ namespace TinySTL{
 			}
 		}
 	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	typename Unordered_set<Key, Hash, KeyEqual, Allocator>::iterator 
+		Unordered_set<Key, Hash, KeyEqual, Allocator>::begin(){
+		size_type index = 0;
+		for (; index != buckets_.size(); ++index){
+			if (!(buckets_[index].empty()))
+				break;
+		}
+		if (index == buckets_.size())
+			return end();
+		return iterator(index, buckets_[index].begin(), this);
+	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	typename Unordered_set<Key, Hash, KeyEqual, Allocator>::iterator 
+		Unordered_set<Key, Hash, KeyEqual, Allocator>::end(){
+		return iterator(buckets_.size() - 1, buckets_[buckets_.size() - 1].end(), this);
+	}
 }
 
 #endif
\ No newline at end of file
diff --git a/TinySTL/Unordered_set.h b/TinySTL/Unordered_set.h
index 78f43c3..151b516 100644
--- a/TinySTL/Unordered_set.h
+++ b/TinySTL/Unordered_set.h
@@ -6,13 +6,42 @@
 #include "Functional.h"
 #include "List.h"
 #include "Vector.h"
-#include <list>
-#include <vector>
 
 namespace TinySTL{
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	class Unordered_set;
+	namespace Detail{
+		template<class Key, class ListIterator, class Hash = std::hash<Key>,
+		class KeyEqual = TinySTL::equal_to<Key>, class Allocator = TinySTL::allocator < Key >>
+		class ust_iterator{
+		private:
+			typedef Unordered_set<Key, Hash, KeyEqual, Allocator>* cntrPtr;
+			size_t bucket_index_;
+			ListIterator iterator_;
+			cntrPtr container_;
+		public:
+			ust_iterator(size_t index, ListIterator it, cntrPtr ptr);
+			ust_iterator& operator ++();
+			ust_iterator operator ++(int);
+			Key& operator*(){ return *iterator_; }
+			Key* operator->(){ return &(operator*()); }
+		private:
+			template<class Key, class ListIterator, class Hash, class KeyEqual, class Allocator>
+			friend bool operator ==(const ust_iterator<Key, ListIterator, Hash, KeyEqual, Allocator>& lhs,
+				const ust_iterator<Key, ListIterator, Hash, KeyEqual, Allocator>& rhs);
+			template<class Key, class ListIterator, class Hash, class KeyEqual, class Allocator>
+			friend bool operator !=(const ust_iterator<Key, ListIterator, Hash, KeyEqual, Allocator>& lhs,
+				const ust_iterator<Key, ListIterator, Hash, KeyEqual, Allocator>& rhs);
+		};
+	}//end of namespace Detail
+
+
 	template<class Key, class Hash = std::hash<Key>,
 	class KeyEqual = TinySTL::equal_to<Key>, class Allocator = TinySTL::allocator < Key >>
 	class Unordered_set{
+	private:
+		template<class Key, class ListIterator, class Hash, class KeyEqual, class Allocator>
+		friend class Detail::ust_iterator;
 	public:
 		typedef Key key_type;
 		typedef Key value_type;
@@ -22,6 +51,7 @@ namespace TinySTL{
 		typedef Allocator allocator_type;
 		typedef value_type& reference;
 		typedef const value_type& const_reference;
+		typedef Detail::ust_iterator<Key, typename TinySTL::list<key_type>::iterator, Hash, KeyEqual, Allocator> iterator;
 	private:
 		TinySTL::vector<TinySTL::list<key_type>> buckets_;
 		size_type size_;
@@ -31,8 +61,8 @@ namespace TinySTL{
 		explicit Unordered_set(size_t bucket_count);
 		template<class InputIterator>
 		Unordered_set(InputIterator first, InputIterator last);
-		//Unordered_set(const Unordered_set& ust);
-		//Unordered_set& operator = (const Unordered_set& ust);
+		Unordered_set(const Unordered_set& ust);
+		Unordered_set& operator = (const Unordered_set& ust);
 
 		size_type size()const;
 		bool empty()const;
@@ -41,6 +71,9 @@ namespace TinySTL{
 		size_type bucket(const key_type& key)const;
 		float load_factor()const;
 
+		iterator begin();
+		iterator end();
+
 		haser hash_function()const;
 		key_equal key_eq()const;
 		allocator_type get_allocator()const;