diff --git a/desktop/app.js b/desktop/app.js
index 9fd7da3..536547f 100644
--- a/desktop/app.js
+++ b/desktop/app.js
@@ -18,8 +18,10 @@ let locale = 'en';
 let messages = getMessages(locale);
 let tray = null;
 const repoUrl = 'https://github.com/xxnuo/MTranServer';
+const releasesUrl = 'https://github.com/xxnuo/MTranServer/releases';
 let portCheckPromise = null;
 let desktopLogPath = null;
+let newVersionAvailable = null;
 
 function getLocalHost(host) {
   if (!host || host === '0.0.0.0') return '127.0.0.1';
@@ -38,6 +40,38 @@ function getSettingsUrl(server) {
   return `http://${getLocalHost(server.host)}:${server.port}/ui/settings`;
 }
 
+function compareVersions(current, latest) {
+  const parseCurrent = current.replace(/^v/, '').split('.').map(Number);
+  const parseLatest = latest.replace(/^v/, '').split('.').map(Number);
+  for (let i = 0; i < Math.max(parseCurrent.length, parseLatest.length); i++) {
+    const a = parseCurrent[i] || 0;
+    const b = parseLatest[i] || 0;
+    if (a < b) return -1;
+    if (a > b) return 1;
+  }
+  return 0;
+}
+
+async function checkForUpdate() {
+  try {
+    const response = await fetch(releasesUrl, {
+      headers: { 'Accept': 'text/html' },
+      redirect: 'follow',
+    });
+    if (!response.ok) return;
+    const html = await response.text();
+    const match = html.match(/\/xxnuo\/MTranServer\/releases\/tag\/v?([\d.]+)/);
+    if (!match) return;
+    const latestVersion = match[1];
+    const currentVersion = app.getVersion();
+    if (compareVersions(currentVersion, latestVersion) < 0) {
+      newVersionAvailable = latestVersion;
+      updateTray();
+    }
+  } catch {
+  }
+}
+
 function getStatusLabel() {
   const status = getServerStatus();
   if (status === 'running') {
@@ -76,6 +110,8 @@ function updateTray() {
     messages,
     statusLabel: getStatusLabel(),
     versionLabel: app.getVersion(),
+    newVersionLabel: newVersionAvailable,
+    autoStartEnabled: app.getLoginItemSettings().openAtLogin,
     onOpenBrowserUi: () => shell.openExternal(getUiUrl(desktopConfig.server)),
     onOpenBrowserDocs: () => shell.openExternal(getDocsUrl(desktopConfig.server)),
     onOpenRepo: () => shell.openExternal(repoUrl),
@@ -83,10 +119,18 @@ function updateTray() {
     onRestart: restartServer,
     onOpenModels: () => shell.openPath(desktopConfig.server.modelDir),
     onOpenConfig: () => shell.openPath(desktopConfig.server.configDir),
+    onToggleAutoStart: toggleAutoStart,
+    onOpenReleasePage: () => shell.openExternal(releasesUrl),
     onQuit: quitApp
   });
 }
 
+function toggleAutoStart() {
+  const current = app.getLoginItemSettings().openAtLogin;
+  app.setLoginItemSettings({ openAtLogin: !current });
+  updateTray();
+}
+
 async function logDesktop(message, error) {
   if (!desktopLogPath) return;
   const timestamp = new Date().toISOString();
@@ -244,6 +288,8 @@ export async function startDesktop() {
     messages,
     statusLabel: getStatusLabel(),
     versionLabel: app.getVersion(),
+    newVersionLabel: newVersionAvailable,
+    autoStartEnabled: app.getLoginItemSettings().openAtLogin,
     onOpenBrowserUi: () => shell.openExternal(getUiUrl(desktopConfig.server)),
     onOpenBrowserDocs: () => shell.openExternal(getDocsUrl(desktopConfig.server)),
     onOpenRepo: () => shell.openExternal(repoUrl),
@@ -251,6 +297,8 @@ export async function startDesktop() {
     onRestart: restartServer,
     onOpenModels: () => shell.openPath(desktopConfig.server.modelDir),
     onOpenConfig: () => shell.openPath(desktopConfig.server.configDir),
+    onToggleAutoStart: toggleAutoStart,
+    onOpenReleasePage: () => shell.openExternal(releasesUrl),
     onQuit: quitApp
   });
 
@@ -260,6 +308,8 @@ export async function startDesktop() {
     return;
   }
 
+  checkForUpdate();
+
   const getConfigResponse = async () => buildDesktopResponse();
   const applyConfig = async (config) => {
     desktopConfig = await saveDesktopConfig(config);
diff --git a/desktop/config.js b/desktop/config.js
index 21be224..d2e95c1 100644
--- a/desktop/config.js
+++ b/desktop/config.js
@@ -76,28 +76,78 @@ function normalizeConfig(input) {
   };
 }
 
+function getDiffConfig(config) {
+  const defaults = getDefaultDesktopConfig();
+  const diff = {};
+  if (config.locale !== defaults.locale) {
+    diff.locale = config.locale;
+  }
+  const serverDiff = {};
+  const serverKeys = Object.keys(defaults.server);
+  for (const key of serverKeys) {
+    if (config.server[key] !== defaults.server[key]) {
+      serverDiff[key] = config.server[key];
+    }
+  }
+  if (Object.keys(serverDiff).length > 0) {
+    diff.server = serverDiff;
+  }
+  return diff;
+}
+
+function isConfigDefault(config) {
+  const diff = getDiffConfig(config);
+  return Object.keys(diff).length === 0;
+}
+
 export async function loadDesktopConfig() {
   try {
     const raw = await fsPromises.readFile(desktopConfigPath, 'utf8');
     const parsed = YAML.parse(raw);
-    return normalizeConfig(parsed);
-  } catch (error) {
-    const defaults = getDefaultDesktopConfig();
-    await saveDesktopConfig(defaults);
-    return defaults;
+    const normalized = normalizeConfig(parsed);
+    const diff = getDiffConfig(normalized);
+    if (Object.keys(diff).length === 0) {
+      try {
+        await fsPromises.unlink(desktopConfigPath);
+      } catch {
+      }
+    } else {
+      const currentDiff = getDiffConfig(normalizeConfig(parsed));
+      const parsedKeys = Object.keys(parsed?.server || {});
+      const defaultKeys = Object.keys(getDefaultDesktopConfig().server);
+      const hasRemovedKeys = parsedKeys.some(k => !defaultKeys.includes(k));
+      if (hasRemovedKeys) {
+        await fsPromises.mkdir(serverConfigDir, { recursive: true });
+        const data = YAML.stringify(diff);
+        await fsPromises.writeFile(desktopConfigPath, data, 'utf8');
+      }
+    }
+    return normalized;
+  } catch {
+    return getDefaultDesktopConfig();
   }
 }
 
 export async function saveDesktopConfig(config) {
   const normalized = normalizeConfig(config);
-  await fsPromises.mkdir(serverConfigDir, { recursive: true });
-  const data = YAML.stringify(normalized);
-  await fsPromises.writeFile(desktopConfigPath, data, 'utf8');
+  const diff = getDiffConfig(normalized);
+  if (Object.keys(diff).length === 0) {
+    try {
+      await fsPromises.unlink(desktopConfigPath);
+    } catch {
+    }
+  } else {
+    await fsPromises.mkdir(serverConfigDir, { recursive: true });
+    const data = YAML.stringify(diff);
+    await fsPromises.writeFile(desktopConfigPath, data, 'utf8');
+  }
   return normalized;
 }
 
 export async function resetDesktopConfig() {
-  const defaults = getDefaultDesktopConfig();
-  await saveDesktopConfig(defaults);
-  return defaults;
+  try {
+    await fsPromises.unlink(desktopConfigPath);
+  } catch {
+  }
+  return getDefaultDesktopConfig();
 }
diff --git a/desktop/i18n.js b/desktop/i18n.js
index 32e8e9f..4a7d834 100644
--- a/desktop/i18n.js
+++ b/desktop/i18n.js
@@ -15,6 +15,8 @@ const messages = {
     trayOpenModels: 'Open Model Folder',
     trayOpenConfig: 'Open Config Folder',
     trayVersion: 'Version',
+    trayNewVersion: 'New version available: v{version}',
+    trayAutoStart: 'Start at Login',
     trayQuit: 'Quit',
     appName: 'MTranServer',
     portInUseTitle: 'Port is in use',
@@ -41,6 +43,8 @@ const messages = {
     trayOpenModels: '打开模型目录',
     trayOpenConfig: '打开配置目录',
     trayVersion: '版本号',
+    trayNewVersion: '发现新版本: v{version}',
+    trayAutoStart: '开机启动',
     trayQuit: '退出程序',
     appName: 'MTranServer',
     portInUseTitle: '端口被占用',
@@ -67,6 +71,8 @@ const messages = {
     trayOpenModels: 'モデルフォルダを開く',
     trayOpenConfig: '設定フォルダを開く',
     trayVersion: 'バージョン',
+    trayNewVersion: '新しいバージョンがあります: v{version}',
+    trayAutoStart: 'ログイン時に起動',
     trayQuit: '終了',
     appName: 'MTranServer',
     portInUseTitle: 'ポートが使用中です',
diff --git a/desktop/tray.js b/desktop/tray.js
index ebe4d68..22b8718 100644
--- a/desktop/tray.js
+++ b/desktop/tray.js
@@ -8,6 +8,8 @@ export function createTray({
   messages,
   statusLabel,
   versionLabel,
+  newVersionLabel,
+  autoStartEnabled,
   onOpenBrowserUi,
   onOpenBrowserDocs,
   onOpenRepo,
@@ -15,6 +17,8 @@ export function createTray({
   onRestart,
   onOpenModels,
   onOpenConfig,
+  onToggleAutoStart,
+  onOpenReleasePage,
   onQuit
 }) {
   if (tray) return tray;
@@ -25,6 +29,8 @@ export function createTray({
     messages,
     statusLabel,
     versionLabel,
+    newVersionLabel,
+    autoStartEnabled,
     onOpenBrowserUi,
     onOpenBrowserDocs,
     onOpenRepo,
@@ -32,6 +38,8 @@ export function createTray({
     onRestart,
     onOpenModels,
     onOpenConfig,
+    onToggleAutoStart,
+    onOpenReleasePage,
     onQuit
   });
   return tray;
@@ -41,6 +49,8 @@ export function updateTrayMenu({
   messages,
   statusLabel,
   versionLabel,
+  newVersionLabel,
+  autoStartEnabled,
   onOpenBrowserUi,
   onOpenBrowserDocs,
   onOpenRepo,
@@ -48,10 +58,12 @@ export function updateTrayMenu({
   onRestart,
   onOpenModels,
   onOpenConfig,
+  onToggleAutoStart,
+  onOpenReleasePage,
   onQuit
 }) {
   if (!tray) return;
-  const contextMenu = Menu.buildFromTemplate([
+  const menuItems = [
     {
       label: messages.trayOpenUi,
       click: onOpenBrowserUi
@@ -76,6 +88,12 @@ export function updateTrayMenu({
         { label: messages.trayRestart, click: onRestart }
       ]
     },
+    {
+      label: messages.trayAutoStart,
+      type: 'checkbox',
+      checked: autoStartEnabled,
+      click: onToggleAutoStart
+    },
     { type: 'separator' },
     {
       label: messages.trayData,
@@ -87,11 +105,18 @@ export function updateTrayMenu({
     {
       label: `${messages.trayVersion}: ${versionLabel}`,
       enabled: false
-    },
-    {
-      label: messages.trayQuit,
-      click: onQuit
     }
-  ]);
+  ];
+  if (newVersionLabel) {
+    menuItems.push({
+      label: messages.trayNewVersion.replace('{version}', newVersionLabel),
+      click: onOpenReleasePage
+    });
+  }
+  menuItems.push({
+    label: messages.trayQuit,
+    click: onQuit
+  });
+  const contextMenu = Menu.buildFromTemplate(menuItems);
   tray.setContextMenu(contextMenu);
 }