diff --git a/Ink Canvas/Helpers/MultiPPTInkManager.cs b/Ink Canvas/Helpers/MultiPPTInkManager.cs
index 96b618ed..67e4d3cb 100644
--- a/Ink Canvas/Helpers/MultiPPTInkManager.cs	
+++ b/Ink Canvas/Helpers/MultiPPTInkManager.cs	
@@ -174,14 +174,14 @@ namespace Ink_Canvas.Helpers
                     var manager = GetCurrentManager();
                     if (manager != null)
                     {
-                        // 先创建备份
+                        // 保存到管理器
+                        manager.SaveCurrentSlideStrokes(slideIndex, strokes);
+                        
+                        // 只有在保存成功后才创建备份
                         if (!string.IsNullOrEmpty(_currentActivePresentationId))
                         {
                             CreateStrokeBackup(_currentActivePresentationId, slideIndex, strokes);
                         }
-
-                        // 保存到管理器
-                        manager.SaveCurrentSlideStrokes(slideIndex, strokes);
                         
                         // 检查是否需要执行定期备份
                         CheckAndPerformBackup();
diff --git a/Ink Canvas/Helpers/PPTInkManager.cs b/Ink Canvas/Helpers/PPTInkManager.cs
index 7e8afb22..9d02c79c 100644
--- a/Ink Canvas/Helpers/PPTInkManager.cs	
+++ b/Ink Canvas/Helpers/PPTInkManager.cs	
@@ -473,6 +473,13 @@ namespace Ink_Canvas.Helpers
                 return true;
             }
             
+            // 如果当前页面不是锁定页面，但锁定时间很短（小于50ms），允许写入
+            // 这样可以确保旧页面的墨迹能够及时保存
+            if (DateTime.Now - (_inkLockUntil.AddMilliseconds(-InkLockMilliseconds)) < TimeSpan.FromMilliseconds(50))
+            {
+                return true;
+            }
+            
             // 只有在快速切换且页面不同时才锁定
             return false;
         }
diff --git a/Ink Canvas/Helpers/PPTManager.cs b/Ink Canvas/Helpers/PPTManager.cs
index c638914b..44cbc810 100644
--- a/Ink Canvas/Helpers/PPTManager.cs	
+++ b/Ink Canvas/Helpers/PPTManager.cs	
@@ -850,10 +850,24 @@ namespace Ink_Canvas.Helpers
                 // 如果在放映模式，获取放映窗口的演示文稿
                 if (IsInSlideShow && PPTApplication.SlideShowWindows.Count > 0)
                 {
-                    var slideShowWindow = PPTApplication.SlideShowWindows[1];
-                    if (slideShowWindow?.View != null)
+                    try
                     {
-                        return (Presentation)slideShowWindow.View.Slide.Parent;
+                        var slideShowWindow = PPTApplication.SlideShowWindows[1];
+                        if (slideShowWindow?.View != null)
+                        {
+                            return (Presentation)slideShowWindow.View.Slide.Parent;
+                        }
+                    }
+                    catch (COMException comEx)
+                    {
+                        var hr = (uint)comEx.HResult;
+                        if (hr == 0x80048240) // Integer out of range
+                        {
+                            LogHelper.WriteLogToFile($"验证PPT放映窗口失败: {comEx.Message}", LogHelper.LogType.Warning);
+                            // 放映窗口已不存在，返回null
+                            return null;
+                        }
+                        throw; // 重新抛出其他COM异常
                     }
                 }
 
diff --git a/Ink Canvas/MainWindow_cs/MW_PPT.cs b/Ink Canvas/MainWindow_cs/MW_PPT.cs
index 94370fc5..8a1d0a78 100644
--- a/Ink Canvas/MainWindow_cs/MW_PPT.cs	
+++ b/Ink Canvas/MainWindow_cs/MW_PPT.cs	
@@ -1121,14 +1121,48 @@ namespace Ink_Canvas
         {
             try
             {
+                // 检查PPT连接状态
+                if (_pptManager?.IsConnected != true || _pptManager?.IsInSlideShow != true)
+                {
+                    LogHelper.WriteLogToFile($"PPT未连接或未在放映状态，跳过页面切换: IsConnected={_pptManager?.IsConnected}, IsInSlideShow={_pptManager?.IsInSlideShow}", LogHelper.LogType.Warning);
+                    return;
+                }
+
                 // 获取当前页面索引
                 var currentSlideIndex = _pptManager?.GetCurrentSlideNumber() ?? 0;
                 
+                LogHelper.WriteLogToFile($"开始切换页面墨迹: 从第{currentSlideIndex}页到第{newSlideIndex}页", LogHelper.LogType.Trace);
+                
+                // 验证页面索引的有效性
+                if (newSlideIndex <= 0)
+                {
+                    LogHelper.WriteLogToFile($"无效的新页面索引: {newSlideIndex}，跳过页面切换", LogHelper.LogType.Warning);
+                    return;
+                }
+                
                 // 如果有当前墨迹且不是第一次切换，先保存到当前页面
                 if (inkCanvas.Strokes.Count > 0 && currentSlideIndex > 0 && currentSlideIndex != newSlideIndex)
                 {
-                    _multiPPTInkManager?.SaveCurrentSlideStrokes(currentSlideIndex, inkCanvas.Strokes);
-                    LogHelper.WriteLogToFile($"切换前保存第{currentSlideIndex}页墨迹，墨迹数量: {inkCanvas.Strokes.Count}", LogHelper.LogType.Trace);
+                    // 检查是否可以写入墨迹
+                    bool canWrite = _multiPPTInkManager?.CanWriteInk(currentSlideIndex) == true;
+                    LogHelper.WriteLogToFile($"第{currentSlideIndex}页墨迹写入权限: {canWrite}", LogHelper.LogType.Trace);
+                    
+                    if (canWrite)
+                    {
+                        // 正常保存
+                        _multiPPTInkManager?.SaveCurrentSlideStrokes(currentSlideIndex, inkCanvas.Strokes);
+                        LogHelper.WriteLogToFile($"正常保存第{currentSlideIndex}页墨迹，墨迹数量: {inkCanvas.Strokes.Count}", LogHelper.LogType.Trace);
+                    }
+                    else
+                    {
+                        // 墨迹被锁定，跳过保存以避免墨迹错页
+                        LogHelper.WriteLogToFile($"第{currentSlideIndex}页墨迹被锁定，跳过保存以避免墨迹错页", LogHelper.LogType.Warning);
+                    }
+                }
+                else if (inkCanvas.Strokes.Count > 0 && currentSlideIndex <= 0)
+                {
+                    // 无法获取当前页面索引时，不保存墨迹，直接清空
+                    LogHelper.WriteLogToFile($"无法获取当前页面索引({currentSlideIndex})，跳过墨迹保存", LogHelper.LogType.Warning);
                 }
                 
                 // 切换到新页面并加载墨迹
@@ -1137,10 +1171,10 @@ namespace Ink_Canvas
                 {
                     inkCanvas.Strokes.Clear();
                     inkCanvas.Strokes.Add(newStrokes);
+                    LogHelper.WriteLogToFile($"已切换到第{newSlideIndex}页，加载墨迹数量: {newStrokes.Count}", LogHelper.LogType.Trace);
                 }
 
-                // 设置墨迹锁定
-                _multiPPTInkManager?.LockInkForSlide(newSlideIndex);
+                // 注意：LockInkForSlide已经在SwitchToSlide中调用，这里不需要重复调用
             }
             catch (Exception ex)
             {