diff --git a/src/FluFrameless.cpp b/src/FluFrameless.cpp
index 8240bc0e..b0e90297 100644
--- a/src/FluFrameless.cpp
+++ b/src/FluFrameless.cpp
@@ -48,9 +48,8 @@ bool FramelessEventFilter::nativeEventFilter(const QByteArray &eventType, void *
     }else if(uMsg == WM_NCCALCSIZE){
 #if QT_VERSION < QT_VERSION_CHECK(6,0,0)
         NCCALCSIZE_PARAMS& sz = *reinterpret_cast<NCCALCSIZE_PARAMS*>(msg->lParam);
-        if (sz.rgrc[0].top != 0)
-            sz.rgrc[0].top -= 1;
         *result = WVR_REDRAW;
+        sz.rgrc[0].top -= 1;
         return true;
 #endif
     }
diff --git a/src/Qt5/imports/FluentUI/Controls/FluWindow.qml b/src/Qt5/imports/FluentUI/Controls/FluWindow.qml
index 84f0c7e5..f3c70f93 100644
--- a/src/Qt5/imports/FluentUI/Controls/FluWindow.qml
+++ b/src/Qt5/imports/FluentUI/Controls/FluWindow.qml
@@ -237,6 +237,7 @@ Window {
     }
     Rectangle{
         anchors.fill: parent
+        anchors.topMargin: 1/Screen.devicePixelRatio
         color:"transparent"
         border.width: window.resizeBorderWidth
         border.color: window.resizeBorderColor
@@ -249,15 +250,6 @@ Window {
             }
             return true
         }
-        Rectangle{
-            color: parent.border.color
-            width: parent.width
-            height: 1
-            anchors{
-                top: parent.top
-                topMargin: 1
-            }
-        }
     }
     function destoryOnClose(){
         lifecycle.onDestoryOnClose()