diff --git a/example/qml/window/MainWindow.qml b/example/qml/window/MainWindow.qml
index 4c395bb..8e7b763 100644
--- a/example/qml/window/MainWindow.qml
+++ b/example/qml/window/MainWindow.qml
@@ -97,7 +97,7 @@ FluWindow {
         z:999
         items: ItemsOriginal
         footerItems:ItemsFooter
-        topPadding:Qt.platform.os === "osx" ? 20 : 5
+        topPadding:FluTools.isMacos() ? 20 : 5
         displayMode:MainEvent.displayMode
         logo: "qrc:/example/res/image/favicon.ico"
         title:"FluentUI"
diff --git a/src/FluTools.cpp b/src/FluTools.cpp
index 837605b..7c93eb2 100644
--- a/src/FluTools.cpp
+++ b/src/FluTools.cpp
@@ -39,4 +39,27 @@ QString FluTools::readFile(const QString &fileName)
     return content;
 }
 
+bool FluTools::isMacos(){
+#if defined(Q_OS_MACOS)
+    return true;
+#else
+    return false;
+#endif
+}
+
+bool FluTools::isLinux(){
+#if defined(Q_OS_LINUX)
+    return true;
+#else
+    return false;
+#endif
+}
+
+bool FluTools::isWin(){
+#if defined(Q_OS_WIN)
+    return true;
+#else
+    return false;
+#endif
+}
 
diff --git a/src/FluTools.h b/src/FluTools.h
index 0033d23..80a5f78 100644
--- a/src/FluTools.h
+++ b/src/FluTools.h
@@ -42,6 +42,12 @@ public:
      */
     Q_INVOKABLE QString readFile(const QString &fileName);
 
+    Q_INVOKABLE bool isMacos();
+
+    Q_INVOKABLE bool isLinux();
+
+    Q_INVOKABLE bool isWin();
+
 };
 
 #endif // FLUTOOLS_H
diff --git a/src/imports/FluentUI/Controls/FluAppBar.qml b/src/imports/FluentUI/Controls/FluAppBar.qml
index 283bca4..27fb70a 100644
--- a/src/imports/FluentUI/Controls/FluAppBar.qml
+++ b/src/imports/FluentUI/Controls/FluAppBar.qml
@@ -20,7 +20,7 @@ Rectangle{
     property color closeHoverColor:  Qt.rgba(251/255,115/255,115/255,1)
     property bool showDark: false
     property bool titleVisible: true
-    property bool isMac: Qt.platform.os === "osx"
+    property bool isMac: FluTools.isMacos()
     property color borerlessColor : FluTheme.dark ? FluTheme.primaryColor.lighter : FluTheme.primaryColor.dark
     id:root
     color: Qt.rgba(0,0,0,0)