diff --git a/Ink Canvas/App.xaml.cs b/Ink Canvas/App.xaml.cs
index 6a8c1d4e..3766fc55 100644
--- a/Ink Canvas/App.xaml.cs	
+++ b/Ink Canvas/App.xaml.cs	
@@ -292,6 +292,27 @@ namespace Ink_Canvas
         {
             string reason = e.Reason == SessionEndReasons.Logoff ? "用户注销" : "系统关机";
             WriteCrashLog($"系统会话即将结束: {reason}");
+            
+            // 清理PowerPoint进程守护
+            try
+            {
+                // 获取主窗口实例并清理PowerPoint进程守护
+                var mainWindow = Application.Current.MainWindow as MainWindow;
+                if (mainWindow != null)
+                {
+                    // 通过反射调用StopPowerPointProcessMonitoring方法
+                    var method = mainWindow.GetType().GetMethod("StopPowerPointProcessMonitoring", 
+                        System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
+                    method?.Invoke(mainWindow, null);
+                    
+                    WriteCrashLog("PowerPoint进程守护已在系统关机时清理");
+                }
+            }
+            catch (Exception ex)
+            {
+                WriteCrashLog($"清理PowerPoint进程守护失败: {ex.Message}");
+            }
+            
             DeviceIdentifier.SaveUsageStatsOnShutdown();
         }
 
diff --git a/Ink Canvas/Helpers/PPTManager.cs b/Ink Canvas/Helpers/PPTManager.cs
index 146e4e51..47235093 100644
--- a/Ink Canvas/Helpers/PPTManager.cs	
+++ b/Ink Canvas/Helpers/PPTManager.cs	
@@ -443,6 +443,55 @@ namespace Ink_Canvas.Helpers
                         LogHelper.WriteLogToFile($"取消PPT事件注册失败: {ex.GetType().Name} - {ex.Message}", LogHelper.LogType.Warning);
                     }
 
+                    // 释放COM对象
+                    try
+                    {
+                        if (Marshal.IsComObject(CurrentSlide))
+                        {
+                            Marshal.ReleaseComObject(CurrentSlide);
+                        }
+                    }
+                    catch (Exception ex)
+                    {
+                        LogHelper.WriteLogToFile($"释放CurrentSlide COM对象失败: {ex}", LogHelper.LogType.Warning);
+                    }
+
+                    try
+                    {
+                        if (Marshal.IsComObject(CurrentSlides))
+                        {
+                            Marshal.ReleaseComObject(CurrentSlides);
+                        }
+                    }
+                    catch (Exception ex)
+                    {
+                        LogHelper.WriteLogToFile($"释放CurrentSlides COM对象失败: {ex}", LogHelper.LogType.Warning);
+                    }
+
+                    try
+                    {
+                        if (Marshal.IsComObject(CurrentPresentation))
+                        {
+                            Marshal.ReleaseComObject(CurrentPresentation);
+                        }
+                    }
+                    catch (Exception ex)
+                    {
+                        LogHelper.WriteLogToFile($"释放CurrentPresentation COM对象失败: {ex}", LogHelper.LogType.Warning);
+                    }
+
+                    try
+                    {
+                        if (Marshal.IsComObject(PPTApplication))
+                        {
+                            Marshal.ReleaseComObject(PPTApplication);
+                        }
+                    }
+                    catch (Exception ex)
+                    {
+                        LogHelper.WriteLogToFile($"释放PPTApplication COM对象失败: {ex}", LogHelper.LogType.Warning);
+                    }
+
                     // 清理引用
                     PPTApplication = null;
                     CurrentPresentation = null;
diff --git a/Ink Canvas/obj/Debug/net472/InkCanvasForClass.csproj.AssemblyReference.cache b/Ink Canvas/obj/Debug/net472/InkCanvasForClass.csproj.AssemblyReference.cache
index 7126526b..44b9fc73 100644
Binary files a/Ink Canvas/obj/Debug/net472/InkCanvasForClass.csproj.AssemblyReference.cache and b/Ink Canvas/obj/Debug/net472/InkCanvasForClass.csproj.AssemblyReference.cache differ