diff --git a/TinySTL/Test/PairTest.cpp b/TinySTL/Test/PairTest.cpp
new file mode 100644
index 0000000..c8eb905
--- /dev/null
+++ b/TinySTL/Test/PairTest.cpp
@@ -0,0 +1,45 @@
+#include <iostream>
+
+#include "..\Utility.h"
+#include "..\String.h"
+
+using namespace TinySTL;
+int main(){
+	// test ctor
+	pair <string, double> product1;                     // default constructor
+	pair <string, double> product2("tomatoes", 2.30);   // value init
+	pair <string, double> product3(product2);          // copy constructor
+	product1 = make_pair(string("lightbulbs"), 0.99);   // using make_pair (move)
+	product2.first = "shoes";                  // the type of first is string
+	product2.second = 39.90;                   // the type of second is double
+	std::cout << "The price of " << product1.first << " is $" << product1.second << '\n';
+	std::cout << "The price of " << product2.first << " is $" << product2.second << '\n';
+	std::cout << "The price of " << product3.first << " is $" << product3.second << '\n';
+
+	//test operator =
+	pair <string, int> planet, homeplanet;
+	planet = make_pair(string("Earth"), 6371);
+	homeplanet = planet;
+	std::cout << "Home planet: " << homeplanet.first << '\n';
+	std::cout << "Planet size: " << homeplanet.second << '\n';
+
+	//test swap
+	pair<int, char> foo1(10, 'a');
+	pair<int, char> bar1(90, 'z');
+	//foo1.swap(bar1);
+	swap(foo1, bar1);
+	std::cout << "foo contains: " << foo1.first;
+	std::cout << " and " << foo1.second << '\n';
+
+	//test relational operators
+	pair<int, char> foo(10, 'z');
+	pair<int, char> bar(90, 'a');
+	if (foo == bar) std::cout << "foo and bar are equal\n";
+	if (foo != bar) std::cout << "foo and bar are not equal\n";
+	if (foo< bar) std::cout << "foo is less than bar\n";
+	if (foo> bar) std::cout << "foo is greater than bar\n";
+	if (foo <= bar) std::cout << "foo is less than or equal to bar\n";
+	if (foo >= bar) std::cout << "foo is greater than or equal to bar\n";
+	system("pause");
+	return 0;
+}
\ No newline at end of file
diff --git a/TinySTL/TinySTL.vcxproj b/TinySTL/TinySTL.vcxproj
index fd62738..e780ece 100644
--- a/TinySTL/TinySTL.vcxproj
+++ b/TinySTL/TinySTL.vcxproj
@@ -81,6 +81,7 @@
   <ItemGroup>
     <ClCompile Include="main.cpp" />
     <ClCompile Include="Profiler\Profiler.cpp" />
+    <ClCompile Include="Test\PairTest.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="Algorithm.h" />
diff --git a/TinySTL/TinySTL.vcxproj.filters b/TinySTL/TinySTL.vcxproj.filters
index 57f3834..2a2a082 100644
--- a/TinySTL/TinySTL.vcxproj.filters
+++ b/TinySTL/TinySTL.vcxproj.filters
@@ -16,6 +16,9 @@
     <Filter Include="头文件\Profiler">
       <UniqueIdentifier>{092c2875-2b56-404b-977e-a9b4aa67c134}</UniqueIdentifier>
     </Filter>
+    <Filter Include="Test">
+      <UniqueIdentifier>{102ada31-2e23-4fa3-b913-81e7e40d12a7}</UniqueIdentifier>
+    </Filter>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="main.cpp">
@@ -24,6 +27,9 @@
     <ClCompile Include="Profiler\Profiler.cpp">
       <Filter>头文件\Profiler</Filter>
     </ClCompile>
+    <ClCompile Include="Test\PairTest.cpp">
+      <Filter>Test</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="TypeTraits.h">