diff --git a/src/ui/FramelessDelegateWin.cpp b/src/ui/FramelessDelegateWin.cpp
index 208ca85d..5f9ee428 100644
--- a/src/ui/FramelessDelegateWin.cpp
+++ b/src/ui/FramelessDelegateWin.cpp
@@ -191,11 +191,12 @@ bool FramelessDelegateWin::nativeEvent(const QByteArray & eventType, void* messa
         return false;
     }
     case WM_NCLBUTTONDBLCLK: {
+         *result = 0;
         if (mainWidget_->maximumSize() == QSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX) &&
             mainWidget_->windowFlags().testFlag(Qt::WindowMaximizeButtonHint))
             return false;
         else
-            return true;
+            return false;
     }
     case WM_NCRBUTTONUP:
     {
@@ -368,12 +369,13 @@ void FramelessDelegateWin::SetNativeWindowLong() {
     style &= ~WS_MINIMIZEBOX;
     style &= ~WS_MAXIMIZEBOX;
 
-    if (!mainWidget_->windowFlags().testFlag(Qt::WindowMinimizeButtonHint) ||
-        mainWidget_->maximumSize() != QSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX)) {
-        style &= ~WS_MINIMIZEBOX;
+    // 根据 Qt 窗口标志与大小约束，启用系统最小化/最大化按钮能力
+    const bool canResize = (mainWidget_->maximumSize() == QSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX));
+    if (mainWidget_->windowFlags().testFlag(Qt::WindowMinimizeButtonHint) && canResize) {
+        style |= WS_MINIMIZEBOX;
     }
-    if (!mainWidget_->windowFlags().testFlag(Qt::WindowMaximizeButtonHint)) {
-        style &= ~WS_MAXIMIZEBOX;
+    if (mainWidget_->windowFlags().testFlag(Qt::WindowMaximizeButtonHint) && canResize) {
+        style |= WS_MAXIMIZEBOX;
     }
     
     ::SetWindowLongPtr(hwnd, GWL_STYLE, style);
diff --git a/src/ui/FramelessWindow.cpp b/src/ui/FramelessWindow.cpp
index de061545..a941e097 100644
--- a/src/ui/FramelessWindow.cpp
+++ b/src/ui/FramelessWindow.cpp
@@ -6,9 +6,13 @@
 
 FramelessWindow::FramelessWindow(QWidget* parent)
     : QFrame(parent) {
-    setWindowFlags(windowFlags() | Qt::Window | Qt::FramelessWindowHint | Qt::WindowSystemMenuHint);
+    setWindowFlags(windowFlags()
+        | Qt::Window
+        | Qt::FramelessWindowHint
+        | Qt::WindowSystemMenuHint
+        | Qt::WindowMaximizeButtonHint
+        | Qt::WindowMinimizeButtonHint);
 
-    // 初始化平台相关的无边框委托，用于命中测试和缩放。
     delegate_ = FramelessDelegate::Create(this);
 
 }