diff --git a/desktop-client/src/App.vue b/desktop-client/src/App.vue
index 0445e82..69c2f87 100644
--- a/desktop-client/src/App.vue
+++ b/desktop-client/src/App.vue
@@ -132,6 +132,12 @@ const updateState = reactive({
   lastCheckedAt: "",
   message: "",
 });
+const AUTO_UPDATE_CHECK_INTERVAL_MS = 30 * 60 * 1000;
+const updateRuntime = reactive({
+  downloading: false,
+  promptedVersion: "",
+  mandatoryInstalledVersion: "",
+});
 const contextMenu = reactive({
   visible: false,
   x: 0,
@@ -147,6 +153,7 @@ const dropState = reactive({
 });
 let unlistenDragDrop: UnlistenFn | null = null;
 let syncTimer: ReturnType<typeof setInterval> | null = null;
+let updateCheckTimer: ReturnType<typeof setInterval> | null = null;
 
 const toast = reactive({
   visible: false,
@@ -557,6 +564,13 @@ function clearSyncScheduler() {
   syncState.nextRunAt = "";
 }
 
+function clearUpdateScheduler() {
+  if (updateCheckTimer) {
+    clearInterval(updateCheckTimer);
+    updateCheckTimer = null;
+  }
+}
+
 function syncFingerprint(item: LocalSyncFileItem) {
   return `${Number(item.size || 0)}:${Number(item.modifiedMs || 0)}`;
 }
@@ -600,7 +614,11 @@ async function initClientVersion() {
   }
 }
 
-async function checkClientUpdate(showResultToast = true) {
+async function checkClientUpdate(showResultToast = true): Promise<boolean> {
+  if (updateState.checking) {
+    return false;
+  }
+
   updateState.checking = true;
   updateState.message = "";
   const response = await invokeBridge("api_check_client_update", {
@@ -626,22 +644,34 @@ async function checkClientUpdate(showResultToast = true) {
         showToast("当前已是最新版本", "info");
       }
     }
-    return;
+    return true;
   }
 
   updateState.available = false;
+  updateState.downloadUrl = "";
   updateState.message = String(response.data?.message || "检查更新失败");
   if (showResultToast) {
     showToast(updateState.message, "error");
   }
+  return false;
 }
 
-async function installLatestUpdate() {
-  if (!updateState.downloadUrl) {
-    showToast("当前没有可用的更新下载地址", "info");
-    return;
+async function installLatestUpdate(trigger: "manual" | "auto" = "manual"): Promise<boolean> {
+  if (updateRuntime.downloading) {
+    if (trigger === "manual") {
+      showToast("更新包正在下载，请稍候", "info");
+    }
+    return false;
   }
 
+  if (!updateState.downloadUrl) {
+    if (trigger === "manual") {
+      showToast("当前没有可用的更新下载地址", "info");
+    }
+    return false;
+  }
+
+  updateRuntime.downloading = true;
   const taskId = `UPD-${Date.now()}`;
   const installerName = `wanwan-cloud-desktop_v${updateState.latestVersion || updateState.currentVersion}.exe`;
   prependTransferTask({
@@ -661,33 +691,78 @@ async function installLatestUpdate() {
     fileName: installerName,
   });
 
-  if (response.ok && response.data?.success) {
+  try {
+    if (response.ok && response.data?.success) {
+      updateTransferTask(taskId, {
+        speed: "-",
+        progress: 100,
+        status: "done",
+        note: "更新包已下载，准备启动安装",
+      });
+      const savePath = String(response.data?.savePath || "").trim();
+      if (savePath) {
+        try {
+          await openPath(savePath);
+        } catch (error) {
+          console.error("open installer failed", error);
+        }
+      }
+      showToast("更新包已下载，已尝试启动安装程序", "success");
+      return true;
+    }
+
+    const message = String(response.data?.message || "下载更新包失败");
     updateTransferTask(taskId, {
       speed: "-",
-      progress: 100,
-      status: "done",
-      note: "更新包已下载，准备启动安装",
+      progress: 0,
+      status: "failed",
+      note: message,
     });
-    const savePath = String(response.data?.savePath || "").trim();
-    if (savePath) {
-      try {
-        await openPath(savePath);
-      } catch (error) {
-        console.error("open installer failed", error);
-      }
-    }
-    showToast("更新包已下载，已尝试启动安装程序", "success");
+    showToast(message, "error");
+    return false;
+  } finally {
+    updateRuntime.downloading = false;
+  }
+}
+
+async function runAutoUpdateCycle(trigger: "startup" | "login" | "timer" = "startup") {
+  const checked = await checkClientUpdate(false);
+  if (!checked) return;
+
+  if (!updateState.available || !updateState.downloadUrl) {
     return;
   }
 
-  const message = String(response.data?.message || "下载更新包失败");
-  updateTransferTask(taskId, {
-    speed: "-",
-    progress: 0,
-    status: "failed",
-    note: message,
-  });
-  showToast(message, "error");
+  const latestVersion = String(updateState.latestVersion || "").trim();
+  if (!latestVersion) return;
+
+  if (updateState.mandatory) {
+    if (updateRuntime.mandatoryInstalledVersion === latestVersion) {
+      return;
+    }
+
+    showToast(`检测到强制更新 v${latestVersion}，正在下载升级包`, "info");
+    const installed = await installLatestUpdate("auto");
+    if (installed) {
+      updateRuntime.mandatoryInstalledVersion = latestVersion;
+    }
+    return;
+  }
+
+  if (updateRuntime.promptedVersion === latestVersion) {
+    return;
+  }
+
+  updateRuntime.promptedVersion = latestVersion;
+  if (trigger === "timer") {
+    showToast(`发现新版本 v${latestVersion}，可在“版本更新”中安装`, "info");
+    return;
+  }
+
+  const confirmed = window.confirm(`发现新版本 v${latestVersion}，是否立即下载并安装？`);
+  if (confirmed) {
+    await installLatestUpdate("auto");
+  }
 }
 
 async function chooseSyncDirectory() {
@@ -747,6 +822,16 @@ function rebuildSyncScheduler() {
   }, intervalMinutes * 60 * 1000);
 }
 
+function rebuildUpdateScheduler() {
+  clearUpdateScheduler();
+  if (!authenticated.value) {
+    return;
+  }
+  updateCheckTimer = setInterval(() => {
+    void runAutoUpdateCycle("timer");
+  }, AUTO_UPDATE_CHECK_INTERVAL_MS);
+}
+
 async function clearSyncSnapshot() {
   if (!syncState.localDir.trim()) {
     showToast("请先配置本地同步目录", "info");
@@ -1034,9 +1119,10 @@ async function restoreSession() {
   authenticated.value = true;
   loadSyncConfig();
   rebuildSyncScheduler();
+  rebuildUpdateScheduler();
   await loadFiles("/");
   await loadShares(true);
-  await checkClientUpdate(false);
+  await runAutoUpdateCycle("startup");
 }
 
 function buildItemPath(item: FileItem) {
@@ -1101,11 +1187,12 @@ async function handleLogin() {
     showToast("登录成功，正在同步文件目录", "success");
     loadSyncConfig();
     rebuildSyncScheduler();
+    rebuildUpdateScheduler();
     await loadFiles("/");
     if (!user.value) {
       await loadProfile();
     }
-    await checkClientUpdate(false);
+    await runAutoUpdateCycle("login");
     return;
   }
 
@@ -1117,6 +1204,7 @@ async function handleLogin() {
 async function handleLogout() {
   await invokeBridge("api_logout", { baseUrl: appConfig.baseUrl });
   clearSyncScheduler();
+  clearUpdateScheduler();
   authenticated.value = false;
   user.value = null;
   files.value = [];
@@ -1137,6 +1225,9 @@ async function handleLogout() {
   syncState.lastRunAt = "";
   syncState.lastSummary = "";
   syncState.nextRunAt = "";
+  updateRuntime.downloading = false;
+  updateRuntime.promptedVersion = "";
+  updateRuntime.mandatoryInstalledVersion = "";
   showToast("已退出客户端", "info");
 }
 
@@ -1611,6 +1702,7 @@ onBeforeUnmount(() => {
   window.removeEventListener("click", handleGlobalClick);
   window.removeEventListener("keydown", handleGlobalKey);
   clearSyncScheduler();
+  clearUpdateScheduler();
   if (unlistenDragDrop) {
     unlistenDragDrop();
     unlistenDragDrop = null;
@@ -1753,10 +1845,12 @@ onBeforeUnmount(() => {
               <button class="action-btn" @click="clearSyncSnapshot">重建索引</button>
             </template>
             <template v-else-if="nav === 'updates'">
-              <button class="action-btn" :disabled="updateState.checking" @click="checkClientUpdate()">
+              <button class="action-btn" :disabled="updateState.checking || updateRuntime.downloading" @click="checkClientUpdate()">
                 {{ updateState.checking ? "检查中..." : "检查更新" }}
               </button>
-              <button class="action-btn" :disabled="!updateState.available || !updateState.downloadUrl" @click="installLatestUpdate">立即更新</button>
+              <button class="action-btn" :disabled="updateRuntime.downloading || !updateState.available || !updateState.downloadUrl" @click="installLatestUpdate('manual')">
+                {{ updateRuntime.downloading ? "下载中..." : "立即更新" }}
+              </button>
             </template>
           </div>
         </header>
@@ -1959,6 +2053,7 @@ onBeforeUnmount(() => {
                   </div>
 
                   <div class="update-meta">
+                    <span>自动检查：已开启（每 30 分钟）</span>
                     <span>上次检查：{{ updateState.lastCheckedAt ? formatDate(updateState.lastCheckedAt) : "-" }}</span>
                     <span>提示：{{ updateState.message || "可手动点击“检查更新”获取最新信息" }}</span>
                   </div>