diff --git a/.vs/Algorithm/v16/.suo b/.vs/Algorithm/v16/.suo
index 00d4a18..a6bcb9e 100644
Binary files a/.vs/Algorithm/v16/.suo and b/.vs/Algorithm/v16/.suo differ
diff --git a/code/code.vcxproj b/code/code.vcxproj
index 0f332f7..6986421 100644
--- a/code/code.vcxproj
+++ b/code/code.vcxproj
@@ -140,13 +140,16 @@
   </ItemDefinitionGroup>
   <ItemGroup>
     <ClInclude Include="include\1_ContainsNearbyDuplicate.h" />
+    <ClInclude Include="include\2_ExcelSheetColumnTitle.h" />
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="src\1_ContainsNearbyDuplicate.cpp" />
+    <ClCompile Include="src\2_ExcelSheetColumnTitle.cpp" />
     <ClCompile Include="src\main.cpp" />
   </ItemGroup>
   <ItemGroup>
     <None Include="config\1_ContainsNearbyDuplicate.ini" />
+    <None Include="config\2_ExcelSheetColumnTiTle.ini" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
diff --git a/code/code.vcxproj.filters b/code/code.vcxproj.filters
index 619842e..279cc21 100644
--- a/code/code.vcxproj.filters
+++ b/code/code.vcxproj.filters
@@ -18,6 +18,9 @@
     <ClInclude Include="include\1_ContainsNearbyDuplicate.h">
       <Filter>头文件</Filter>
     </ClInclude>
+    <ClInclude Include="include\2_ExcelSheetColumnTitle.h">
+      <Filter>头文件</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="src\1_ContainsNearbyDuplicate.cpp">
@@ -26,10 +29,16 @@
     <ClCompile Include="src\main.cpp">
       <Filter>源文件</Filter>
     </ClCompile>
+    <ClCompile Include="src\2_ExcelSheetColumnTitle.cpp">
+      <Filter>源文件</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <None Include="config\1_ContainsNearbyDuplicate.ini">
       <Filter>资源文件</Filter>
     </None>
+    <None Include="config\2_ExcelSheetColumnTiTle.ini">
+      <Filter>资源文件</Filter>
+    </None>
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/code/config/2_ExcelSheetColumnTiTle.ini b/code/config/2_ExcelSheetColumnTiTle.ini
new file mode 100644
index 0000000..6c9611f
--- /dev/null
+++ b/code/config/2_ExcelSheetColumnTiTle.ini
@@ -0,0 +1,36 @@
+[Test1]
+Na=1
+nExpect=A
+[Test2]
+Na=2
+nExpect=B
+[Test3]
+Na=26
+nExpect=Z
+[Test4]
+Na=1
+nExpect=A
+[Test5]
+Na=27
+nExpect=AA
+[Test6]
+Na=52
+nExpect=AZ
+[Test7]
+Na=53
+nExpect=BA
+[Test8]
+Na=100
+nExpect=CV
+[Test9]
+Na=
+nExpect=
+[Test10]
+Na=5000
+nExpect=GJH
+[Test11]
+Na=10000
+nExpect=NTP
+[Test12]
+Na=2147483647
+nExpect=FXSHRXW
\ No newline at end of file
diff --git a/code/include/2_ExcelSheetColumnTitle.h b/code/include/2_ExcelSheetColumnTitle.h
new file mode 100644
index 0000000..a1ff4b7
--- /dev/null
+++ b/code/include/2_ExcelSheetColumnTitle.h
@@ -0,0 +1,6 @@
+#pragma once
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+char* ExcelSheetColumnTitle(int n);
\ No newline at end of file
diff --git a/code/src/2_ExcelSheetColumnTitle.cpp b/code/src/2_ExcelSheetColumnTitle.cpp
new file mode 100644
index 0000000..b9b990d
--- /dev/null
+++ b/code/src/2_ExcelSheetColumnTitle.cpp
@@ -0,0 +1,18 @@
+#include "../include/2_ExcelSheetColumnTitle.h"
+//��Ŀ������һ���������������� Excel �������Ӧ�������ƣ������Excel�����Ҳ������У��򷵻�""��
+//˼·��1.��nȡ�࣬�ѵõ���������'A'�Ӻ���ǰ�ŵ��ַ����У�n = n/26,ѭ������ֱ��nΪ0
+//		2.�ַ������Ȳ���7��ָ����ƣ�ȥ��ǰ��Ŀ�λ
+char* ExcelSheetColumnTitle(int n)
+{												//int���ʹ���0����Ϊ0~2147483647��������7��A~Z����ĸ��ʾ��int���ᳬ��26��7�η�
+	char* ret = (char*)malloc(sizeof(char) * 8);//������������8�ֽڵĿռ䣬һ���ֽڴ��\0��־
+	int i = 7;									//���������ַ����е�ÿ���ַ�
+	ret[7] = '\0';								//�������\0
+	while (n) {									//��n����0ʱ����
+		n -= 1;									//��n��һ����Ϊn�����Ǵ��ַ�'A'��ʼ����ӵ�
+		ret[i-1] = n % 26 + 'A';				//�Ӻ���ǰ��ֵ�������һ����ֵ����һ��
+		n /= 26;
+		i--;									//����һ���ַ���ֵ
+	}
+	return ret + i;								//ȥ��ǰ���ǰ���ַ������ǰ��û���ַ���ָ�����
+	free(ret);
+}
\ No newline at end of file
diff --git a/test/pch.h b/test/pch.h
index d0edafb..a50326e 100644
--- a/test/pch.h
+++ b/test/pch.h
@@ -15,6 +15,7 @@
 
 
 #include"../code/include/1_ContainsNearbyDuplicate.h"
+#include"../code/include/2_ExcelSheetColumnTitle.h"
 
 
 int CalcCount(int n, char(*str)[10], const char* FileName);
diff --git a/test/test.cpp b/test/test.cpp
index a5c62e4..55aaa7f 100644
--- a/test/test.cpp
+++ b/test/test.cpp
@@ -3,6 +3,9 @@
 
 using namespace Microsoft::VisualStudio::CppUnitTestFramework;
 #define FileName_1  "../code/config/1_ContainsNearbyDuplicate.ini"
+#define FileName_2  "../code/config/2_ExcelSheetColumnTiTle.ini"
+
+
 namespace test1
 {
 	TEST_CLASS(UnitTest_1)
@@ -27,12 +30,19 @@ namespace test1
 }
 namespace test2
 {
-	TEST_CLASS(test)
+	TEST_CLASS(UnitTest_1)
 	{
-	public:
-
-		TEST_METHOD(TestMethod1)
+		TEST_METHOD(TestMethode1)
 		{
+			char Section_Name[100][10] = { 0 };
+			int  Section_Count = CalcCount(100, Section_Name, FileName_2);
+			CString Na, nExpect;
+			for (int i = 0; i < Section_Count; i++) {
+				GetPrivateProfileString(Section_Name[i], "Na", " ", Na.GetBuffer(20), 20, FileName_2);
+				GetPrivateProfileString(Section_Name[i], "nExpect", " ", nExpect.GetBuffer(100), 100, FileName_2);
+				char* nReal = ExcelSheetColumnTitle(_ttoi(Na));
+				Assert::AreEqual(nReal, nExpect);
+			}
 		}
 	};
 }