diff --git a/TinySTL/Detail/Unordered_set.impl.h b/TinySTL/Detail/Unordered_set.impl.h
new file mode 100644
index 0000000..60e7754
--- /dev/null
+++ b/TinySTL/Detail/Unordered_set.impl.h
@@ -0,0 +1,56 @@
+#ifndef _UNORDERED_SET_IMPL_H_
+#define _UNORDERED_SET_IMPL_H_
+
+namespace TinySTL{
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	size_t Unordered_set<Key, Hash, KeyEqual, Allocator>::prime_list_[PRIME_LIST_SIZE] = {
+		53, 97, 193, 389, 769, 1543, 3079, 6151, 12289, 24593, 49157, 98317, 196613, 393241,
+		786433, 1572869, 3145739, 6291469, 12582917, 25165843, 50331653, 100663319, 201326611,
+		402653189, 805306457, 1610612741, 3221225473, 4294967291,
+	};
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	bool Unordered_set<Key, Hash, KeyEqual, Allocator>::has_key(const key_type& key){
+		auto& list = buckets_[bucket_index(key)];
+		return TinySTL::find(list.begin(), list.end(), key) != list.end();
+	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	typename Unordered_set<Key, Hash, KeyEqual, Allocator>::size_type
+		Unordered_set<Key, Hash, KeyEqual, Allocator>::bucket_index(const key_type& key)const{
+		return haser()(key) % buckets_.size();
+	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	typename Unordered_set<Key, Hash, KeyEqual, Allocator>::size_type
+		Unordered_set<Key, Hash, KeyEqual, Allocator>::next_prime(size_type n)const{
+		auto i = 0;
+		for (; i != PRIME_LIST_SIZE; ++i){
+			if (n > prime_list_[i])
+				continue;
+			else
+				break;
+		}
+		i = (i == PRIME_LIST_SIZE ? PRIME_LIST_SIZE - 1 : i);
+		return prime_list_[i];
+	}
+	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);
+		size_ = 0;
+	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	template<class InputIterator>
+	Unordered_set<Key, Hash, KeyEqual, Allocator>::Unordered_set(InputIterator first, InputIterator last){
+		size_ = 0;
+		auto len = last - first;
+		buckets_.resize(len);
+		for (; first != last; ++first){
+			auto index = bucket_index(*first);
+			if (!has_key(*first)){
+				buckets_[index].push_front(*first);
+				++size_;
+			}
+		}
+	}
+}
+
+#endif
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diff --git a/TinySTL/Unordered_set.h b/TinySTL/Unordered_set.h
new file mode 100644
index 0000000..9b89d17
--- /dev/null
+++ b/TinySTL/Unordered_set.h
@@ -0,0 +1,43 @@
+#ifndef _UNORDERED_SET_H_
+#define _UNORDERED_SET_H_
+
+#include "Allocator.h"
+#include "Algorithm.h"
+#include "Functional.h"
+#include "List.h"
+#include "Vector.h"
+#include <list>
+#include <vector>
+
+namespace TinySTL{
+	template<class Key, class Hash = std::hash<Key>,
+	class KeyEqual = TinySTL::equal_to<Key>, class Allocator = TinySTL::allocator < Key >>
+	class Unordered_set{
+	public:
+		typedef Key key_type;
+		typedef Key value_type;
+		typedef size_t size_type;
+		typedef Hash haser;
+		typedef Allocator allocator_type;
+		typedef value_type& reference;
+		typedef const value_type& const_reference;
+	private:
+		TinySTL::vector<TinySTL::list<key_type>> buckets_;
+		size_type size_;
+#define PRIME_LIST_SIZE 28
+		static size_t prime_list_[PRIME_LIST_SIZE];
+	public:
+		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);
+	private:
+		size_type next_prime(size_type n)const;
+		size_type bucket_index(const key_type& key)const;
+		bool has_key(const key_type& key);
+	};
+}//end of namespace TinySTL
+
+#include "Detail\Unordered_set.impl.h"
+#endif
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