diff --git a/src/main.cpp b/src/main.cpp
index 5c9b28ef..fd8417fb 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -58,8 +58,10 @@ int main(int argc, char* argv[]) {
 
 
     MainFrame mainWindow;
-    splash.showMessage(("正在创建主窗口..."), Qt::AlignHCenter | Qt::AlignBottom, Qt::white);
+    splash.showMessage(("正在创建主窗口..."), Qt::AlignHCenter | Qt::AlignBottom, Qt:: white);
+    // 先显示窗口，再在事件循环启动后最大化，避免首次显示时原生窗口放置未就绪导致尺寸异常
     mainWindow.showMaximized();
+    // QTimer::singleShot(0, &mainWindow, &MainFrame::showMaximized);
     splash.finish(&mainWindow);
 
 
diff --git a/src/scene/OEScene.cpp b/src/scene/OEScene.cpp
index a1f7082d..0b666bf8 100644
--- a/src/scene/OEScene.cpp
+++ b/src/scene/OEScene.cpp
@@ -114,7 +114,6 @@ bool OEScene::AddToScene(osg::Node* node) const {
 }
 
 void OEScene::SetHomeViewpoint(const osgEarth::Viewpoint& viewpoint, double duration_s) {
-    return;
 	dyt_check(nullptr != earthManipulator_);
 	
 	earthManipulator_->setViewpoint(viewpoint, duration_s);
diff --git a/src/ui/FramelessDelegateWin.cpp b/src/ui/FramelessDelegateWin.cpp
index 5f9ee428..d0f98894 100644
--- a/src/ui/FramelessDelegateWin.cpp
+++ b/src/ui/FramelessDelegateWin.cpp
@@ -162,19 +162,31 @@ bool FramelessDelegateWin::nativeEvent(const QByteArray & eventType, void* messa
     case WM_NCHITTEST: {
         return OnNCTitTest(msg, result);
     }
-    case WM_GETMINMAXINFO:
-    {
-        if (::IsZoomed(msg->hwnd)) {
-            RECT frame = { 0, 0, 0, 0 };
-            AdjustWindowRectEx(&frame, WS_OVERLAPPEDWINDOW, FALSE, 0);
-            double dpr = mainWidget_->devicePixelRatioF();
+    case WM_GETMINMAXINFO: {
+        // 使用工作区定义最大化位置与大小，避免遮挡任务栏
+        MINMAXINFO* mmi = reinterpret_cast<MINMAXINFO*>(msg->lParam);
+        HMONITOR monitor = MonitorFromWindow(msg->hwnd, MONITOR_DEFAULTTONEAREST);
+        MONITORINFO mi;
+        ::ZeroMemory(&mi, sizeof(mi));
+        mi.cbSize = sizeof(mi);
+        if (monitor && GetMonitorInfo(monitor, &mi)) {
+            const RECT& work = mi.rcWork;
+            const RECT& rcMon = mi.rcMonitor;
+            mmi->ptMaxPosition.x = work.left;
+            mmi->ptMaxPosition.y = work.top;
+            mmi->ptMaxSize.x = work.right - work.left;
+            mmi->ptMaxSize.y = work.bottom - work.top;
+            // 限制拖动最大尺寸为监视器大小（非必须，但较合理）
+            mmi->ptMaxTrackSize.x = rcMon.right - rcMon.left;
+            mmi->ptMaxTrackSize.y = rcMon.bottom - rcMon.top;
+        }
 
-            // 最大化时不叠加系统边框内边距，避免左右出现可见空隙
+        if (::IsZoomed(msg->hwnd)) {
+            // 最大化时不叠加系统边框内边距
             frames_.setLeft(0);
             frames_.setTop(0);
             frames_.setRight(0);
             frames_.setBottom(0);
-
             mainWidget_->setContentsMargins(margins_);
             justMaximized_ = true;
         } else {
@@ -188,7 +200,8 @@ bool FramelessDelegateWin::nativeEvent(const QByteArray & eventType, void* messa
         if (nullptr != titleBar_ && flag) {
             titleBar_->OnMaximized(justMaximized_);
         }
-        return false;
+        *result = 0;
+        return true;
     }
     case WM_NCLBUTTONDBLCLK: {
          *result = 0;
@@ -212,13 +225,13 @@ bool FramelessDelegateWin::nativeEvent(const QByteArray & eventType, void* messa
 
 void FramelessDelegateWin::OnShow() {
     if (isFirstShow_) {
-        isFirstShow_ = false;
-
         SetNativeWindowLong();
+        isFirstShow_ = false;
     }
 
     mainWidget_->setAttribute(Qt::WA_Resized);
-    if (!isFirstShow_ && mainWidget_->isMaximized()) {
+    // 仅当存在有效的窗口放置信息（length 已设置）时才恢复窗口位置，避免首次显示使用未初始化的数据
+    if (!isFirstShow_ && mainWidget_->isMaximized() && wndPlaceMent_.length == sizeof(wndPlaceMent_)) {
         QMetaObject::invokeMethod(
             this,
             [=]() {