diff --git a/list.md b/list.md
index ae25556..ac8b223 100644
--- a/list.md
+++ b/list.md
@@ -4,8 +4,8 @@
 
 简要说明：完成程序入口、主窗口创建、消息循环和基础对话框处理。
 
-- [ ] `_tWinMain` - `src/source/Tetris.cpp`
-- [ ] `MyRegisterClass` - `src/source/Tetris.cpp`
+- [x] `_tWinMain` - `src/source/Tetris.cpp`
+- [x] `MyRegisterClass` - `src/source/Tetris.cpp`
 - [ ] `InitInstance` - `src/source/Tetris.cpp`
 - [ ] `WndProc` - `src/source/Tetris.cpp`
 - [ ] `About` - `src/source/Tetris.cpp`
diff --git a/report/images/Part1/MyRegisterClassAfter.png b/report/images/Part1/MyRegisterClassAfter.png
new file mode 100644
index 0000000..ea5d33e
Binary files /dev/null and b/report/images/Part1/MyRegisterClassAfter.png differ
diff --git a/report/images/Part1/MyRegisterClass.png b/report/images/Part1/MyRegisterClassBefore.png
similarity index 100%
rename from report/images/Part1/MyRegisterClass.png
rename to report/images/Part1/MyRegisterClassBefore.png
diff --git a/src/source/Tetris.cpp b/src/source/Tetris.cpp
index eb6c088..956f549 100644
--- a/src/source/Tetris.cpp
+++ b/src/source/Tetris.cpp
@@ -50,7 +50,22 @@ ATOM MyRegisterClass(HINSTANCE hInstance)
 {
     // TODO(作业2): 注册窗口类。
     UNREFERENCED_PARAMETER(hInstance);
-    return 0;
+    WNDCLASSEX wcex;
+
+    wcex.cbSize = sizeof(WNDCLASSEX);
+    wcex.style = CS_HREDRAW | CS_VREDRAW;
+    wcex.lpfnWndProc = WndProc;
+    wcex.cbClsExtra = 0;
+    wcex.cbWndExtra = 0;
+    wcex.hInstance = hInstance;
+    wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_TETRIS));
+    wcex.hCursor = LoadCursor(nullptr, IDC_ARROW);
+    wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
+    wcex.lpszMenuName = MAKEINTRESOURCE(IDC_TETRIS);
+    wcex.lpszClassName = szWindowClass;
+    wcex.hIconSm = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_SMALL));
+
+    return RegisterClassEx(&wcex);
 }
 
 BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)