diff --git a/src/cad_mcp_plugins/mcp_plugins.cpp b/src/cad_mcp_plugins/mcp_plugins.cpp
index 8425c96..e4e602b 100644
--- a/src/cad_mcp_plugins/mcp_plugins.cpp
+++ b/src/cad_mcp_plugins/mcp_plugins.cpp
@@ -66,6 +66,69 @@ namespace
 		free(pImageCodecInfo);
 		return -1;
 	}
+
+	// 判断窗口客户区中心点是否被其它窗口遮挡。
+	// 原理：取客户区中心换算到屏幕坐标，用 WindowFromPoint 取该点最顶层窗口，
+	// 若其根窗口与目标窗口的根窗口不同，即视为被遮挡。
+	bool IsWindowOccluded(HWND hwnd)
+	{
+		if (!hwnd || !::IsWindow(hwnd))
+			return false;
+
+		RECT rc;
+		if (!::GetClientRect(hwnd, &rc))
+			return false;
+
+		POINT pt;
+		pt.x = (rc.left + rc.right) / 2;
+		pt.y = (rc.top + rc.bottom) / 2;
+		::ClientToScreen(hwnd, &pt);
+
+		HWND hAtPoint = ::WindowFromPoint(pt);
+		if (!hAtPoint)
+			return false;
+
+		return ::GetAncestor(hAtPoint, GA_ROOT) != ::GetAncestor(hwnd, GA_ROOT);
+	}
+
+	// 把窗口强制置到前台并重绘。
+	// SetForegroundWindow 在调用进程不是前台进程时会被系统忽略，故先用
+	// AttachThreadInput 把当前线程与前台线程的输入队列挂接，再设置前台窗口。
+	bool ForceWindowForeground(HWND hwnd)
+	{
+		if (!hwnd || !::IsWindow(hwnd))
+			return false;
+
+		if (::IsIconic(hwnd))
+			::ShowWindow(hwnd, SW_RESTORE);
+		if (!::IsWindowVisible(hwnd))
+			::ShowWindow(hwnd, SW_SHOW);
+
+		if (::GetForegroundWindow() == hwnd)
+			return true;
+
+		HWND hFore = ::GetForegroundWindow();
+		DWORD foreThread = hFore ? ::GetWindowThreadProcessId(hFore, NULL) : 0;
+		DWORD thisThread = ::GetCurrentThreadId();
+
+		bool attached = false;
+		if (foreThread != 0 && foreThread != thisThread)
+			attached = (::AttachThreadInput(foreThread, thisThread, TRUE) != 0);
+
+		::SetWindowPos(hwnd, HWND_TOP, 0, 0, 0, 0,
+			SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);
+		::BringWindowToTop(hwnd);
+		::SetForegroundWindow(hwnd);
+
+		if (attached)
+			::AttachThreadInput(foreThread, thisThread, FALSE);
+
+		// 同步重绘，避免截到旧画面（RDW_UPDATENOW 会立即处理 WM_PAINT）
+		::RedrawWindow(hwnd, NULL, NULL,
+			RDW_INVALIDATE | RDW_UPDATENOW | RDW_ALLCHILDREN);
+
+		return ::GetForegroundWindow() == hwnd;
+	}
 }
 
 class mcp_Tool_ViewportScreenshot: public mcp_Tool
@@ -78,7 +141,18 @@ public:
 		if (!hWnd)
 			return mcp_Tool_Utility::make_error(-32000, L"无法获取CAD绘图区窗口句柄");
 
-		// 2. 初始化 GDI+
+		// 2. 确保窗口在前台：GDI 抓屏读的是屏幕内容，被其它窗口遮挡就会截到别的窗口。
+		//    先尝试把 CAD 主窗口置前并重绘，再记录是否仍被遮挡。
+		bool wasOccluded = IsWindowOccluded(hWnd);
+		if (wasOccluded || ::GetForegroundWindow() != ::GetAncestor(hWnd, GA_ROOT))
+		{
+			HWND hMain = adsw_acadMainWnd();
+			ForceWindowForeground(hMain ? hMain : hWnd);
+			::Sleep(120); // 留一点时间给 DWM 合成，避免截到旧帧
+		}
+		bool stillOccluded = IsWindowOccluded(hWnd);
+
+		// 3. 初始化 GDI+
 		Gdiplus::GdiplusStartupInput gdiplusStartupInput;
 		ULONG_PTR gdiplusToken;
 		Gdiplus::GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);
@@ -86,7 +160,7 @@ public:
 		std::string base64Result;
 		bool success = false;
 
-		// 3. 开始 Windows GDI 抓屏逻辑 (使用花括号限定生命周期)
+		// 4. 开始 Windows GDI 抓屏逻辑 (使用花括号限定生命周期)
 		{
 			RECT rc;
 			GetClientRect(hWnd, &rc);
@@ -139,13 +213,23 @@ public:
 			ReleaseDC(hWnd, hdcScreen);
 		}
 
-		// 4. 关闭 GDI+
+		// 5. 关闭 GDI+
 		Gdiplus::GdiplusShutdown(gdiplusToken);
 
-		// 5. 按照 MCP 多模态协议返回数据
+		// 6. 按照 MCP 多模态协议返回数据
 		if (success)
 		{
-			return mcp_Tool_Utility::make_mixed_result(L"已成功截取 AutoCAD 当前视口画面。", base64Result, "image/png");
+			std::wstring msg = L"已成功截取 AutoCAD 当前视口画面。";
+			if (stillOccluded)
+			{
+				// 窗口被遮挡时 GDI 抓屏会读到遮挡窗口的内容，截图不可靠，显式提示。
+				msg += L"（警告：CAD 绘图区可能仍被其它窗口遮挡，截图内容可能不准确）";
+			}
+			else if (wasOccluded)
+			{
+				msg += L"（已将 CAD 窗口置前，避免截到遮挡窗口）";
+			}
+			return mcp_Tool_Utility::make_mixed_result(msg, base64Result, "image/png");
 		}
 		else
 		{