diff --git a/Ink Canvas/Helpers/PPTManager.cs b/Ink Canvas/Helpers/PPTManager.cs
index b3c42d22..95ab8d26 100644
--- a/Ink Canvas/Helpers/PPTManager.cs	
+++ b/Ink Canvas/Helpers/PPTManager.cs	
@@ -543,8 +543,36 @@ namespace Ink_Canvas.Helpers
                         }
                         else
                         {
-                            _lastPolledSlideNumber = -1;
-                            SlidesCount = 0;
+                            if (_lastSlideShowState)
+                            {
+                                LogHelper.WriteLogToFile("轮询检测到放映已结束", LogHelper.LogType.Trace);
+                                
+                                PPTROTConnectionHelper.SafeReleaseComObject(_pptSlideShowWindow);
+                                _pptSlideShowWindow = null;
+                                _lastPolledSlideNumber = -1;
+                                _polling = 1;
+                                SlidesCount = 0;
+                                
+                                _lastSlideShowState = false;
+                                SlideShowStateChanged?.Invoke(false);
+                                
+                                if (_pptActivePresentation != null)
+                                {
+                                    try
+                                    {
+                                        OnSlideShowEnd(_pptActivePresentation);
+                                    }
+                                    catch (Exception ex)
+                                    {
+                                        LogHelper.WriteLogToFile($"触发SlideShowEnd事件失败: {ex.Message}", LogHelper.LogType.Warning);
+                                    }
+                                }
+                            }
+                            else
+                            {
+                                _lastPolledSlideNumber = -1;
+                                SlidesCount = 0;
+                            }
                         }
                     }
                     else
@@ -878,7 +906,35 @@ namespace Ink_Canvas.Helpers
                 }
                 else
                 {
-                    SlidesCount = 0;
+                    if (_lastSlideShowState)
+                    {
+                        LogHelper.WriteLogToFile("轮询检测到放映已结束", LogHelper.LogType.Trace);
+                        
+                        PPTROTConnectionHelper.SafeReleaseComObject(_pptSlideShowWindow);
+                        _pptSlideShowWindow = null;
+                        _lastPolledSlideNumber = -1;
+                        _polling = 1;
+                        SlidesCount = 0;
+                        
+                        _lastSlideShowState = false;
+                        SlideShowStateChanged?.Invoke(false);
+                        
+                        if (_pptActivePresentation != null)
+                        {
+                            try
+                            {
+                                OnSlideShowEnd(_pptActivePresentation);
+                            }
+                            catch (Exception ex)
+                            {
+                                LogHelper.WriteLogToFile($"触发SlideShowEnd事件失败: {ex.Message}", LogHelper.LogType.Warning);
+                            }
+                        }
+                    }
+                    else
+                    {
+                        SlidesCount = 0;
+                    }
                 }
             }
             catch (Exception ex)
diff --git a/Ink Canvas/Helpers/PPTROTConnectionHelper.cs b/Ink Canvas/Helpers/PPTROTConnectionHelper.cs
index e223a256..cd067f5d 100644
--- a/Ink Canvas/Helpers/PPTROTConnectionHelper.cs	
+++ b/Ink Canvas/Helpers/PPTROTConnectionHelper.cs	
@@ -394,21 +394,21 @@ namespace Ink_Canvas.Helpers
 
                 if (fgPid == sswPid) return true;
 
-                try
-                {
-                    using (Process fgProc = Process.GetProcessById((int)fgPid))
-                    using (Process appProc = Process.GetProcessById((int)sswPid))
+                    try
                     {
-                        string fgName = fgProc.ProcessName.ToLower();
-                        string appName = appProc.ProcessName.ToLower();
-
-                        if (fgName.StartsWith("wps") && appName.StartsWith("wpp"))
+                        using (Process fgProc = Process.GetProcessById((int)fgPid))
+                        using (Process appProc = Process.GetProcessById((int)sswPid))
                         {
-                            return true;
+                            string fgName = fgProc.ProcessName.ToLower();
+                            string appName = appProc.ProcessName.ToLower();
+
+                            if (fgName.StartsWith("wps") && appName.StartsWith("wpp"))
+                            {
+                                return true;
+                            }
                         }
                     }
-                }
-                catch { }
+                    catch { }
 
                 return false;
             }