diff --git a/Ink Canvas/Helpers/AutoUpdateHelper.cs b/Ink Canvas/Helpers/AutoUpdateHelper.cs
index 72e4c559..544b5d76 100644
--- a/Ink Canvas/Helpers/AutoUpdateHelper.cs	
+++ b/Ink Canvas/Helpers/AutoUpdateHelper.cs	
@@ -1050,8 +1050,19 @@ namespace Ink_Canvas.Helpers
                 }
 
                 // 依次尝试每个线路组
+                CancellationToken groupLoopToken;
+                lock (_activeDownloadLock)
+                {
+                    groupLoopToken = _activeDownloadCts?.Token ?? CancellationToken.None;
+                }
                 foreach (var group in groups)
                 {
+                    if (groupLoopToken.IsCancellationRequested)
+                    {
+                        LogHelper.WriteLogToFile("AutoUpdate | 用户已取消，停止尝试后续线路组");
+                        break;
+                    }
+
                     string url = string.Format(group.DownloadUrlFormat, version);
                     url = AppendX64SuffixBeforeZipExtension(url);
                     // 智教联盟需要先获取真实下载地址
@@ -1077,6 +1088,12 @@ namespace Ink_Canvas.Helpers
 
                     bool downloadSuccess = await DownloadFile(url, zipFilePath, progressCallback);
 
+                    if (groupLoopToken.IsCancellationRequested)
+                    {
+                        LogHelper.WriteLogToFile("AutoUpdate | 用户已取消，停止尝试后续线路组");
+                        break;
+                    }
+
                     if (downloadSuccess)
                     {
                         SaveDownloadStatus(true);
@@ -1294,8 +1311,20 @@ namespace Ink_Canvas.Helpers
                                     success = true;
                                     LogHelper.WriteLogToFile($"AutoUpdate | 分块{block.Index}下载成功");
                                 }
-                                catch (Exception ex) when (ex is HttpRequestException || ex is IOException || ex is TaskCanceledException)
+                                catch (Exception ex) when (ex is HttpRequestException || ex is IOException || ex is TaskCanceledException || ex is OperationCanceledException)
                                 {
+                                    // 用户主动取消：不再重试
+                                    if (externalToken.IsCancellationRequested)
+                                    {
+                                        LogHelper.WriteLogToFile($"AutoUpdate | 分块{block.Index}下载已被用户取消", LogHelper.LogType.Warning);
+                                        if (File.Exists(tempPath))
+                                        {
+                                            try { File.Delete(tempPath); } catch { }
+                                        }
+                                        cts.Cancel();
+                                        return;
+                                    }
+
                                     LogHelper.WriteLogToFile($"AutoUpdate | 分块{block.Index}下载失败，第{retry + 1}次: {ex.Message}", LogHelper.LogType.Warning);
                                     progressCallback?.Invoke(0, $"分块{block.Index}下载失败，第{retry + 1}次: {ex.Message}");
 
@@ -1306,7 +1335,8 @@ namespace Ink_Canvas.Helpers
                                     }
 
                                     // 增加重试间隔，避免频繁重试
-                                    await Task.Delay(2000 * (retry + 1));
+                                    try { await Task.Delay(2000 * (retry + 1), externalToken); }
+                                    catch (OperationCanceledException) { cts.Cancel(); return; }
                                 }
                             }
                             if (success)
diff --git a/Ink Canvas/Windows/SettingsViews/Pages/UpdatePage.xaml.cs b/Ink Canvas/Windows/SettingsViews/Pages/UpdatePage.xaml.cs
index c88ddb86..19f40ebc 100644
--- a/Ink Canvas/Windows/SettingsViews/Pages/UpdatePage.xaml.cs	
+++ b/Ink Canvas/Windows/SettingsViews/Pages/UpdatePage.xaml.cs	
@@ -467,26 +467,36 @@ namespace Ink_Canvas.Windows.SettingsViews.Pages
             {
                 ChangelogViewer.Markdown = "正在加载更新日志...";
 
-                // 优先尝试从 GitHub API 获取最新 Release 的 body
+                // 优先尝试从 GitHub API 获取最新 Release 的 body（带超时，失败则回退到镜像）
                 try
                 {
-                    var releases = await AutoUpdateHelper.GetAllGithubReleases(SettingsManager.Settings.Startup.UpdateChannel);
-                    var latest = releases?
-                        .OrderByDescending(r => ParseVersionForSort(r.version))
-                        .Select(r => (Tuple<string, string, string>)Tuple.Create(r.version, r.downloadUrl, r.releaseNotes))
-                        .FirstOrDefault();
-                    if (latest != null && !string.IsNullOrWhiteSpace(latest.Item3))
+                    var apiTask = AutoUpdateHelper.GetAllGithubReleases(SettingsManager.Settings.Startup.UpdateChannel);
+                    var completed = await System.Threading.Tasks.Task.WhenAny(apiTask, System.Threading.Tasks.Task.Delay(TimeSpan.FromSeconds(8)));
+                    if (completed == apiTask)
                     {
-                        ChangelogViewer.Markdown = latest.Item3;
-                        return;
+                        var releases = await apiTask;
+                        var latest = releases?
+                            .OrderByDescending(r => ParseVersionForSort(r.version))
+                            .Select(r => (Tuple<string, string, string>)Tuple.Create(r.version, r.downloadUrl, r.releaseNotes))
+                            .FirstOrDefault();
+                        if (latest != null && !string.IsNullOrWhiteSpace(latest.Item3))
+                        {
+                            ChangelogViewer.Markdown = latest.Item3;
+                            return;
+                        }
+                        LogHelper.WriteLogToFile("UpdatePage | GitHub API 未返回可用的更新日志，回退到镜像", LogHelper.LogType.Warning);
+                    }
+                    else
+                    {
+                        LogHelper.WriteLogToFile("UpdatePage | GitHub API 获取更新日志超时，回退到镜像", LogHelper.LogType.Warning);
                     }
                 }
                 catch (Exception ex)
                 {
-                    LogHelper.WriteLogToFile($"UpdatePage | GitHub API 获取更新日志失败，回退到镜像源: {ex.Message}", LogHelper.LogType.Warning);
+                    LogHelper.WriteLogToFile($"UpdatePage | GitHub API 获取更新日志失败，回退到镜像: {ex.Message}", LogHelper.LogType.Warning);
                 }
 
-                // 回退到镜像源
+                // 回退到镜像源 UpdateLog.md
                 string md = await AutoUpdateHelper.GetUpdateLog(SettingsManager.Settings.Startup.UpdateChannel);
                 ChangelogViewer.Markdown = string.IsNullOrEmpty(md) ? "暂无更新日志。" : md;
             }