diff --git a/list.md b/list.md
index 31dd418..d5695e8 100644
--- a/list.md
+++ b/list.md
@@ -8,7 +8,7 @@
 - [x] `MyRegisterClass` - `src/source/Tetris.cpp`
 - [x] `InitInstance` - `src/source/Tetris.cpp`
 - [x] `WndProc` - `src/source/Tetris.cpp`
-- [ ] `About` - `src/source/Tetris.cpp`
+- [x] `About` - `src/source/Tetris.cpp`
 
 ## 第二阶段：游戏区域与状态初始化
 
diff --git a/report/images/Part1/AboutBefore.png b/report/images/Part1/AboutBefore.png
new file mode 100644
index 0000000..46517a6
Binary files /dev/null and b/report/images/Part1/AboutBefore.png differ
diff --git a/src/source/Tetris.cpp b/src/source/Tetris.cpp
index fd3d091..a42f892 100644
--- a/src/source/Tetris.cpp
+++ b/src/source/Tetris.cpp
@@ -146,7 +146,19 @@ INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
     UNREFERENCED_PARAMETER(lParam);
     // TODO(作业5): 补全“关于”对话框的消息处理。
     UNREFERENCED_PARAMETER(hDlg);
-    UNREFERENCED_PARAMETER(message);
-    UNREFERENCED_PARAMETER(wParam);
+    switch (message)
+    {
+    case WM_INITDIALOG:
+        return (INT_PTR)TRUE;
+
+    case WM_COMMAND:
+        if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
+        {
+            EndDialog(hDlg, LOWORD(wParam));
+            return (INT_PTR)TRUE;
+        }
+        break;
+    }
+
     return (INT_PTR)FALSE;
 }