diff --git a/frontend/scripts/regression-data-process-wizard.mjs b/frontend/scripts/regression-data-process-wizard.mjs
index 0d298fe..f6be3c5 100644
--- a/frontend/scripts/regression-data-process-wizard.mjs
+++ b/frontend/scripts/regression-data-process-wizard.mjs
@@ -12,6 +12,10 @@ const confirmDialogPath = path.resolve(scriptDir, '../src/components/AppConfirmD
 const layoutPath = path.resolve(scriptDir, '../src/layouts/MainLayout.vue')
 const apiPath = path.resolve(scriptDir, '../src/api/modules/dataProcess.ts')
 const contractTypesPath = path.resolve(scriptDir, '../src/types/dataProcess.ts')
+const requestPath = path.resolve(scriptDir, '../src/api/request.ts')
+const authStorePath = path.resolve(scriptDir, '../src/stores/auth.ts')
+const routerPath = path.resolve(scriptDir, '../src/router/index.ts')
+const sessionActivityPath = path.resolve(scriptDir, '../src/utils/sessionActivity.ts')
 const sourceUploadWorkerPath = path.join(createDir, 'useDataProcessSourceUpload.ts')
 const viewSource = await readFile(viewPath, 'utf8')
 const layoutSource = await readFile(layoutPath, 'utf8')
@@ -25,6 +29,18 @@ const [stateSource, generationSource, previewBuildSource, sourceUploadWorkerSour
   readFile(contractTypesPath, 'utf8'),
 ])
 const implementationSource = [viewSource, stateSource, generationSource, previewBuildSource, sourceUploadWorkerSource].join('\n')
+const [requestSource, authStoreSource, routerSource, sessionActivitySource] = await Promise.all([
+  readFile(requestPath, 'utf8'),
+  readFile(authStorePath, 'utf8'),
+  readFile(routerPath, 'utf8'),
+  readFile(sessionActivityPath, 'utf8'),
+])
+
+assert.match(requestSource, /if \(res\.code === 0\) \{[\s\S]*?touchSessionActivity\(\)/, '成功 API 请求没有刷新会话活跃时间')
+assert.match(authStoreSource, /const loginTime = sessionActivityTime/, '认证状态没有共享请求层的会话活跃时间')
+assert.match(authStoreSource, /if \(currentUser\.value\) touchSessionActivity\(\)/, '会话续期仍可能在长任务结束后失效')
+assert.match(routerSource, /const auth = useAuthStore\(\)[\s\S]*?auth\.syncSession\(\)[\s\S]*?if \(!auth\.isLoggedIn\)/, '路由守卫没有在登录判断前同步 API 活跃时间')
+assert.match(sessionActivitySource, /export function touchSessionActivity\(\)/, '缺少统一会话活跃续期函数')
 
 assert.ok(existsSync(confirmDialogPath), '缺少公共确认弹窗组件 AppConfirmDialog')
 const confirmDialogSource = await readFile(confirmDialogPath, 'utf8')
diff --git a/frontend/src/api/request.ts b/frontend/src/api/request.ts
index 9c39c92..2ba341d 100644
--- a/frontend/src/api/request.ts
+++ b/frontend/src/api/request.ts
@@ -1,5 +1,6 @@
 import axios, { type AxiosInstance, type AxiosRequestConfig } from 'axios'
 import { ElMessage } from 'element-plus'
+import { touchSessionActivity } from '@/utils/sessionActivity'
 
 /**
  * 后端统一响应格式
@@ -29,9 +30,12 @@ service.interceptors.response.use(
     const res = response.data as ApiResult
     // 二进制流等非 JSON 响应直接返回
     if (response.config.responseType === 'blob' || response.config.responseType === 'arraybuffer') {
+      touchSessionActivity()
       return response
     }
     if (res.code === 0) {
+      // 生成进度轮询也属于用户正在使用系统，避免长任务结束后被误判为会话过期。
+      touchSessionActivity()
       return res.data
     }
     // 业务错误
diff --git a/frontend/src/router/index.ts b/frontend/src/router/index.ts
index c02d992..741501c 100644
--- a/frontend/src/router/index.ts
+++ b/frontend/src/router/index.ts
@@ -298,6 +298,7 @@ function requiredPermission(path: string, explicit?: unknown) {
 // 全局守卫：登录校验 + 会话超时
 router.beforeEach((to, _from, next) => {
   const auth = useAuthStore()
+  auth.syncSession()
   document.title = to.meta.title ? `${to.meta.title} - 远光软件微调平台` : '远光软件微调平台'
 
   if (to.meta.public) {
diff --git a/frontend/src/stores/auth.ts b/frontend/src/stores/auth.ts
index 5a3eb24..8fa9712 100644
--- a/frontend/src/stores/auth.ts
+++ b/frontend/src/stores/auth.ts
@@ -3,6 +3,13 @@ import { ref, computed } from 'vue'
 import { login as loginApi } from '@/api/modules/system'
 import { SESSION_TIMEOUT } from '@/constants'
 import type { PermissionCode, SystemUser } from '@/types'
+import {
+  clearSessionActivity,
+  sessionActivityTime,
+  startSessionActivity,
+  syncSessionActivity,
+  touchSessionActivity,
+} from '@/utils/sessionActivity'
 
 const USER_STORAGE_KEY = 'currentUser'
 
@@ -60,7 +67,7 @@ export const useAuthStore = defineStore('auth', () => {
     if (currentUser.value?.role === 'operator') return '操作员'
     return '观察员'
   })
-  const loginTime = ref<number>(parseInt(localStorage.getItem('loginTime') || '0', 10) || 0)
+  const loginTime = sessionActivityTime
 
   const isLoggedIn = computed(() => {
     if (!loginTime.value) return false
@@ -71,10 +78,9 @@ export const useAuthStore = defineStore('auth', () => {
   async function login(user: string, password: string) {
     const response = await loginApi(user, password)
     currentUser.value = response.user
-    loginTime.value = Date.now()
+    startSessionActivity()
     localStorage.setItem('username', response.user.username)
     localStorage.setItem(USER_STORAGE_KEY, JSON.stringify(response.user))
-    localStorage.setItem('loginTime', String(loginTime.value))
   }
 
   /** 检查当前账号是否拥有指定模块权限。 */
@@ -85,19 +91,20 @@ export const useAuthStore = defineStore('auth', () => {
 
   /** 续期会话（活跃时刷新） */
   function refresh() {
-    if (isLoggedIn.value) {
-      loginTime.value = Date.now()
-      localStorage.setItem('loginTime', String(loginTime.value))
-    }
+    if (currentUser.value) touchSessionActivity()
+  }
+
+  /** 在路由判断前吸收其他标签页写入的最后活跃时间。 */
+  function syncSession() {
+    syncSessionActivity()
   }
 
   /** 退出 */
   function logout() {
     currentUser.value = null
-    loginTime.value = 0
+    clearSessionActivity()
     localStorage.removeItem('username')
     localStorage.removeItem(USER_STORAGE_KEY)
-    localStorage.removeItem('loginTime')
   }
 
   return {
@@ -110,6 +117,7 @@ export const useAuthStore = defineStore('auth', () => {
     hasPermission,
     login,
     refresh,
+    syncSession,
     logout,
   }
 })
diff --git a/frontend/src/utils/sessionActivity.ts b/frontend/src/utils/sessionActivity.ts
new file mode 100644
index 0000000..d0b488a
--- /dev/null
+++ b/frontend/src/utils/sessionActivity.ts
@@ -0,0 +1,32 @@
+import { ref } from 'vue'
+
+const LOGIN_TIME_STORAGE_KEY = 'loginTime'
+
+function storedActivityTime() {
+  return Number.parseInt(localStorage.getItem(LOGIN_TIME_STORAGE_KEY) || '0', 10) || 0
+}
+
+/**
+ * 会话按“最后活跃时间”计算，而不是从首次登录起固定倒计时。
+ * 该 ref 被认证 store 与请求层共享，确保 API 活动可以立即影响路由守卫。
+ */
+export const sessionActivityTime = ref(storedActivityTime())
+
+export function startSessionActivity() {
+  sessionActivityTime.value = Date.now()
+  localStorage.setItem(LOGIN_TIME_STORAGE_KEY, String(sessionActivityTime.value))
+}
+
+export function touchSessionActivity() {
+  if (!sessionActivityTime.value) return
+  startSessionActivity()
+}
+
+export function syncSessionActivity() {
+  sessionActivityTime.value = storedActivityTime()
+}
+
+export function clearSessionActivity() {
+  sessionActivityTime.value = 0
+  localStorage.removeItem(LOGIN_TIME_STORAGE_KEY)
+}