diff --git a/src/Thunks/user32.hpp b/src/Thunks/user32.hpp
index e851936..52cb5df 100644
--- a/src/Thunks/user32.hpp
+++ b/src/Thunks/user32.hpp
@@ -335,40 +335,69 @@ namespace YY::Thunks
     BOOL,
     WINAPI,
     AdjustWindowRectExForDpi,
-        _Inout_ LPRECT lpRect,
-        _In_ DWORD dwStyle,
-        _In_ BOOL bMenu,
-        _In_ DWORD dwExStyle,
-        _In_ UINT dpi
+        _Inout_ LPRECT _pRect,
+        _In_ DWORD _fStyle,
+        _In_ BOOL _bMenu,
+        _In_ DWORD _fExStyle,
+        _In_ UINT _uDpi
         )
     {
-        if (auto const pAdjustWindowRectExForDpi = try_get_AdjustWindowRectExForDpi())
+        if (auto const _pfnAdjustWindowRectExForDpi = try_get_AdjustWindowRectExForDpi())
         {
-            return pAdjustWindowRectExForDpi(lpRect, dwStyle, bMenu, dwExStyle, dpi);
+            return _pfnAdjustWindowRectExForDpi(_pRect, _fStyle, _bMenu, _fExStyle, _uDpi);
         }
 
-        RECT FrameRect = {};
-
-        if (!AdjustWindowRectEx(&FrameRect, dwStyle, bMenu, dwExStyle))
+        if (_uDpi == 0ul)
         {
+            SetLastError(ERROR_INVALID_PARAMETER);
             return FALSE;
         }
 
-        auto nDpiX = internal::GetDpiForSystemDownlevel();
-
-        if (nDpiX != dpi)
+        RECT _DeltaRect = {};
+        if (!AdjustWindowRectEx(&_DeltaRect, _fStyle, _bMenu, _fExStyle))
         {
-            FrameRect.left = MulDiv(FrameRect.left, dpi, nDpiX);
-            FrameRect.top = MulDiv(FrameRect.top, dpi, nDpiX);
-            FrameRect.right = MulDiv(FrameRect.right, dpi, nDpiX);
-            FrameRect.bottom = MulDiv(FrameRect.bottom, dpi, nDpiX);
+            return FALSE;
         }
 
-        lpRect->left += FrameRect.left;
-        lpRect->top += FrameRect.top;
-        lpRect->right += FrameRect.right;
-        lpRect->bottom += FrameRect.bottom;
+        const auto _uBaseDpi = internal::GetDpiForSystemDownlevel();
+        if (_uBaseDpi != _uDpi)
+        {
+            RECT _DlgFrameRect = {};
+            if (_fStyle & (WS_THICKFRAME | WS_DLGFRAME))
+            {
+                AdjustWindowRectEx(&_DlgFrameRect, WS_DLGFRAME, FALSE, 0);
+                if (_bMenu || (_fStyle & WS_CAPTION) == WS_CAPTION)
+                {
+                    const auto _nSystemBorderWidth = GetSystemMetrics(SM_CXBORDER);
+                    _DlgFrameRect.top -= _nSystemBorderWidth;
+                }
+            }
+            else if (_fStyle & WS_BORDER)
+            {
+                AdjustWindowRectEx(&_DlgFrameRect, WS_BORDER, FALSE, 0);
+                if (_bMenu || (_fStyle & WS_CAPTION) == WS_CAPTION)
+                {
+                    // 特殊优化，不在调用 GetSystemMetrics(SM_CXBORDER)
+                    // 毕竟理论上 _DlgFrameRect.top == -GetSystemMetrics(SM_CXBORDER)
+                    _DlgFrameRect.top += _DlgFrameRect.top;
+                }
+            }
+
+            _DeltaRect.left -= _DlgFrameRect.left;
+            _DeltaRect.top -= _DlgFrameRect.top;
+            _DeltaRect.right -= _DlgFrameRect.right;
+            _DeltaRect.bottom -= _DlgFrameRect.bottom;
+
+            _DeltaRect.left = MulDiv(_DeltaRect.left, _uDpi, _uBaseDpi) + _DlgFrameRect.left;
+            _DeltaRect.top = MulDiv(_DeltaRect.top, _uDpi, _uBaseDpi) + _DlgFrameRect.top;
+            _DeltaRect.right = MulDiv(_DeltaRect.right, _uDpi, _uBaseDpi) + _DlgFrameRect.right;
+            _DeltaRect.bottom = MulDiv(_DeltaRect.bottom, _uDpi, _uBaseDpi) + _DlgFrameRect.bottom;
+        }
 
+        _pRect->left += _DeltaRect.left;
+        _pRect->top += _DeltaRect.top;
+        _pRect->right += _DeltaRect.right;
+        _pRect->bottom += _DeltaRect.bottom;
         return TRUE;
     }
 #endif
diff --git a/src/YY-Thunks.UnitTest/User32.UnitTest.cpp b/src/YY-Thunks.UnitTest/User32.UnitTest.cpp
new file mode 100644
index 0000000..383051e
--- /dev/null
+++ b/src/YY-Thunks.UnitTest/User32.UnitTest.cpp
@@ -0,0 +1,65 @@
+#include "pch.h"
+#include "Thunks/user32.hpp"
+
+namespace User32
+{
+    TEST_CLASS(AdjustWindowRectExForDpi)
+    {
+        AwaysNullGuard Guard;
+
+    public:
+        AdjustWindowRectExForDpi()
+        {
+            Guard |= YY::Thunks::aways_null_try_get_AdjustWindowRectExForDpi;
+        }
+
+        TEST_METHOD(常规测试)
+        {
+            struct TestItem
+            {
+                DWORD fStyle;
+                BOOL bMenu;
+                DWORD fExStyle;
+                UINT uDpi;
+            };
+
+            static constexpr const TestItem kTestItems[] =
+            {
+                { WS_DLGFRAME, TRUE, 0, USER_DEFAULT_SCREEN_DPI },
+                { WS_DLGFRAME, TRUE, 0, USER_DEFAULT_SCREEN_DPI * 2 },
+                { WS_DLGFRAME, FALSE, 0, USER_DEFAULT_SCREEN_DPI * 2 },
+                { WS_THICKFRAME, TRUE, 0, USER_DEFAULT_SCREEN_DPI },
+                { WS_THICKFRAME, TRUE, 0, USER_DEFAULT_SCREEN_DPI * 2 },
+                { WS_THICKFRAME, FALSE, 0, USER_DEFAULT_SCREEN_DPI * 2 },
+                { WS_THICKFRAME | WS_CAPTION, TRUE, 0, USER_DEFAULT_SCREEN_DPI * 2 },
+                { WS_THICKFRAME | WS_CAPTION, FALSE, 0, USER_DEFAULT_SCREEN_DPI * 2 },
+                { WS_CAPTION, TRUE, 0, USER_DEFAULT_SCREEN_DPI * 1.25 },
+                { WS_CAPTION, FALSE, 0, USER_DEFAULT_SCREEN_DPI * 2 },
+                { WS_OVERLAPPEDWINDOW, TRUE, 0, USER_DEFAULT_SCREEN_DPI },
+                { WS_OVERLAPPEDWINDOW, TRUE, 0, USER_DEFAULT_SCREEN_DPI * 1.5 },
+                { WS_OVERLAPPEDWINDOW, FALSE, 0, USER_DEFAULT_SCREEN_DPI * 2 },
+            };
+
+            for (auto& _Item : kTestItems)
+            {
+                RECT _Current = {};
+                ::AdjustWindowRectExForDpi(&_Current, _Item.fStyle, _Item.bMenu, _Item.fExStyle, _Item.uDpi);
+
+                RECT _Target = {};
+                YY::Thunks::aways_null_try_get_AdjustWindowRectExForDpi = false;
+                ::AdjustWindowRectExForDpi(&_Target, _Item.fStyle, _Item.bMenu, _Item.fExStyle, _Item.uDpi);
+                YY::Thunks::aways_null_try_get_AdjustWindowRectExForDpi = true;
+
+                CStringW _szTarget;
+                CStringW _szCurrent;
+                Assert::AreEqual(_szTarget.GetString(), _szCurrent.GetString());
+            }
+        }
+
+        TEST_METHOD(畸形测试)
+        {
+            RECT _Current = {};
+            Assert::IsFalse(::AdjustWindowRectExForDpi(&_Current, 0, 0, 0, 0));
+        }
+    };
+}
diff --git a/src/YY-Thunks.UnitTest/YY-Thunks.UnitTest.vcxproj b/src/YY-Thunks.UnitTest/YY-Thunks.UnitTest.vcxproj
index 1bdf82a..6cca268 100644
--- a/src/YY-Thunks.UnitTest/YY-Thunks.UnitTest.vcxproj
+++ b/src/YY-Thunks.UnitTest/YY-Thunks.UnitTest.vcxproj
@@ -202,6 +202,7 @@
     <ClCompile Include="api-ms-win-core-threadpool.UnitTest.cpp" />
     <ClCompile Include="PropSys.UnitTest.cpp" />
     <ClCompile Include="shell32.UnitTest.cpp" />
+    <ClCompile Include="User32.UnitTest.cpp" />
     <ClCompile Include="weak.c">
       <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">NotUsing</PrecompiledHeader>
       <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">NotUsing</PrecompiledHeader>
diff --git a/src/YY-Thunks.UnitTest/YY-Thunks.UnitTest.vcxproj.filters b/src/YY-Thunks.UnitTest/YY-Thunks.UnitTest.vcxproj.filters
index 8045d73..093ffd4 100644
--- a/src/YY-Thunks.UnitTest/YY-Thunks.UnitTest.vcxproj.filters
+++ b/src/YY-Thunks.UnitTest/YY-Thunks.UnitTest.vcxproj.filters
@@ -90,6 +90,9 @@
     <ClCompile Include="api-ms-win-core-winrt-string.UnitTest.cpp">
       <Filter>源文件\UnitTest</Filter>
     </ClCompile>
+    <ClCompile Include="User32.UnitTest.cpp">
+      <Filter>源文件\UnitTest</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="pch.h">