diff --git a/Ink Canvas/MainWindow_cs/MW_ElementsControls.cs b/Ink Canvas/MainWindow_cs/MW_ElementsControls.cs
index 0986d973..cb991b8e 100644
--- a/Ink Canvas/MainWindow_cs/MW_ElementsControls.cs	
+++ b/Ink Canvas/MainWindow_cs/MW_ElementsControls.cs	
@@ -19,7 +19,6 @@ namespace Ink_Canvas
         private FrameworkElement currentSelectedElement;
         private bool isDragging = false;
         private Point dragStartPoint;
-        private bool isElementSelected = false;
 
         #region Image
         private async void BtnImageInsert_Click(object sender, RoutedEventArgs e)
@@ -253,7 +252,6 @@ namespace Ink_Canvas
         private void SelectElement(FrameworkElement element)
         {
             currentSelectedElement = element;
-            isElementSelected = true;
             
             // 根据元素类型显示不同的选择工具栏
             if (element is Image)
@@ -307,7 +305,6 @@ namespace Ink_Canvas
         private void UnselectElement(FrameworkElement element)
         {
             // 去除选中效果
-            isElementSelected = false;
             
             // 隐藏所有选择工具栏
             if (BorderImageSelectionControl != null)
diff --git a/Ink Canvas/MainWindow_cs/MW_FloatingBarIcons.cs b/Ink Canvas/MainWindow_cs/MW_FloatingBarIcons.cs
index 29e6fd09..2bc43aad 100644
--- a/Ink Canvas/MainWindow_cs/MW_FloatingBarIcons.cs	
+++ b/Ink Canvas/MainWindow_cs/MW_FloatingBarIcons.cs	
@@ -2802,7 +2802,7 @@ namespace Ink_Canvas
             await Task.Delay(100);
 
             // Capture screenshot and insert to canvas
-            await CaptureScreenshotAndInsert();
+            CaptureScreenshotAndInsert();
         }
 
         private async void ImageOptionSelectFile_MouseUp(object sender, MouseButtonEventArgs e)
diff --git a/Ink Canvas/MainWindow_cs/MW_PPT.cs b/Ink Canvas/MainWindow_cs/MW_PPT.cs
index f3c05cab..ea3ac813 100644
--- a/Ink Canvas/MainWindow_cs/MW_PPT.cs	
+++ b/Ink Canvas/MainWindow_cs/MW_PPT.cs	
@@ -76,15 +76,11 @@ namespace Ink_Canvas
 
         #region PPT State Management
         private bool wasFloatingBarFoldedWhenEnterSlideShow;
-        private static bool hasShownWpsForceCloseWarning = false;
         private bool isEnteredSlideShowEndEvent; //防止重复调用本函数导致墨迹保存失效
         private bool isPresentationHaveBlackSpace;
-        private string pptName;
-        private bool _isPptClickingBtnTurned;
 
         // 长按翻页相关字段
         private DispatcherTimer _longPressTimer;
-        private bool _isLongPressActive = false;
         private bool _isLongPressNext = true; // true为下一页，false为上一页
         private const int LongPressDelay = 15; // 长按延迟时间（毫秒）
         private const int LongPressInterval = 15; // 长按翻页间隔（毫秒）
@@ -202,7 +198,6 @@ namespace Ink_Canvas
             if (!Settings.PowerPointSettings.EnablePPTButtonLongPressPageTurn) return;
 
             _isLongPressNext = isNext;
-            _isLongPressActive = false;
             _longPressTimer?.Start();
         }
 
@@ -212,7 +207,6 @@ namespace Ink_Canvas
         private void StopLongPressDetection()
         {
             _longPressTimer?.Stop();
-            _isLongPressActive = false;
         }
 
         /// <summary>
@@ -222,7 +216,6 @@ namespace Ink_Canvas
         {
             if (!Settings.PowerPointSettings.EnablePPTButtonLongPressPageTurn) return;
 
-            _isLongPressActive = true;
             _longPressTimer.Interval = TimeSpan.FromMilliseconds(LongPressInterval);
 
             // 执行翻页
@@ -846,8 +839,6 @@ namespace Ink_Canvas
             {
                 try
                 {
-                    _isPptClickingBtnTurned = true;
-
                     // 保存当前页墨迹
                     var currentSlide = _pptManager?.GetCurrentSlideNumber() ?? 0;
                     if (currentSlide > 0)
@@ -889,8 +880,6 @@ namespace Ink_Canvas
             {
                 try
                 {
-                    _isPptClickingBtnTurned = true;
-
                     // 保存当前页墨迹
                     var currentSlide = _pptManager?.GetCurrentSlideNumber() ?? 0;
                     if (currentSlide > 0)
diff --git a/Ink Canvas/MainWindow_cs/MW_TouchEvents.cs b/Ink Canvas/MainWindow_cs/MW_TouchEvents.cs
index a36e7a47..42ae0582 100644
--- a/Ink Canvas/MainWindow_cs/MW_TouchEvents.cs	
+++ b/Ink Canvas/MainWindow_cs/MW_TouchEvents.cs	
@@ -340,7 +340,7 @@ namespace Ink_Canvas
         #endregion
 
 
-        private int lastTouchDownTime = 0, lastTouchUpTime = 0;
+
 
         private Point iniP = new Point(0, 0);