diff --git a/src/api/demo.ts b/src/api/demo.ts
index 85d9fc9..f60bf8c 100644
--- a/src/api/demo.ts
+++ b/src/api/demo.ts
@@ -43,9 +43,7 @@ export interface UserProfile {
 
 export interface AuthResult {
   demoToken: string
-  demoTokenExpiresAt?: number | null
   imToken: string
-  imTokenExpiresAt?: number | null
   profile: UserProfile
 }
 
@@ -66,14 +64,6 @@ export const demoApi = {
     })
   },
 
-  refreshImToken(appId: string = APP_ID): Promise<{ imToken: string; imTokenExpiresAt?: number | null }> {
-    return request('/auth/refresh-im', {
-      method: 'POST',
-      skipAuth: false,
-      params: { appId },
-    })
-  },
-
   getProfile(): Promise<UserProfile> {
     return request('/user/profile')
   },
diff --git a/src/context/AuthContext.tsx b/src/context/AuthContext.tsx
index 4167be0..5771673 100644
--- a/src/context/AuthContext.tsx
+++ b/src/context/AuthContext.tsx
@@ -26,21 +26,10 @@ const AuthContext = createContext<AuthContextValue | null>(null)
 export function AuthProvider({ children }: { children: React.ReactNode }) {
   const [state, setState] = useState<AuthState>({ ready: false, userId: null, profile: null })
 
-  const initSDK = useCallback(async (profile: UserProfile, imToken: string, imTokenExpiresAt?: number | null) => {
+  const initSDK = useCallback(async (profile: UserProfile, imToken: string) => {
     const appKey = profile.appId || APP_ID
     await XuqmSDK.initialize({ appKey })
-    await XuqmSDK.login({
-      userId: profile.userId,
-      userSig: imToken,
-      expiresAt: imTokenExpiresAt ?? undefined,
-      profile,
-      refreshUserSig: async () => {
-        const refreshed = await demoApi.refreshImToken(appKey)
-        await save(K.IM_TOKEN, refreshed.imToken)
-        await save(K.IM_TOKEN_EXPIRES_AT, refreshed.imTokenExpiresAt ?? null)
-        return { userSig: refreshed.imToken, expiresAt: refreshed.imTokenExpiresAt ?? undefined }
-      },
-    })
+    await XuqmSDK.login({ userId: profile.userId, userSig: imToken })
     setState({ ready: true, userId: profile.userId, profile })
 
     UpdateSDK.checkAppUpdate()
@@ -66,10 +55,9 @@ export function AuthProvider({ children }: { children: React.ReactNode }) {
       try {
         const demoToken = await load<string>(K.DEMO_TOKEN)
         const imToken = await load<string>(K.IM_TOKEN)
-        const imTokenExpiresAt = await load<number | null>(K.IM_TOKEN_EXPIRES_AT)
         const profile = await load<UserProfile>(K.PROFILE)
         if (demoToken && imToken && profile) {
-          await initSDK(profile, imToken, imTokenExpiresAt ?? undefined)
+          await initSDK(profile, imToken)
           return
         }
       } catch {
@@ -80,12 +68,11 @@ export function AuthProvider({ children }: { children: React.ReactNode }) {
     restore()
   }, [initSDK])
 
-  const handleAuthResult = useCallback(async (result: { demoToken: string; demoTokenExpiresAt?: number | null; imToken: string; imTokenExpiresAt?: number | null; profile: UserProfile }) => {
+  const handleAuthResult = useCallback(async (result: { demoToken: string; imToken: string; profile: UserProfile }) => {
     await save(K.DEMO_TOKEN, result.demoToken)
     await save(K.IM_TOKEN, result.imToken)
-    await save(K.IM_TOKEN_EXPIRES_AT, result.imTokenExpiresAt ?? null)
     await save(K.PROFILE, result.profile)
-    await initSDK(result.profile, result.imToken, result.imTokenExpiresAt ?? undefined)
+    await initSDK(result.profile, result.imToken)
   }, [initSDK])
 
   const login = useCallback(async (userId: string, password: string) => {
diff --git a/src/utils/storage.ts b/src/utils/storage.ts
index 356fa63..827e775 100644
--- a/src/utils/storage.ts
+++ b/src/utils/storage.ts
@@ -3,7 +3,6 @@ import AsyncStorage from '@react-native-async-storage/async-storage'
 export const K = {
   DEMO_TOKEN: '@xuqm:demoToken',
   IM_TOKEN:   '@xuqm:imToken',
-  IM_TOKEN_EXPIRES_AT: '@xuqm:imTokenExpiresAt',
   PROFILE:    '@xuqm:profile',
   CONTACTS:   '@xuqm:contacts',
 } as const
@@ -23,5 +22,5 @@ export async function remove(key: string): Promise<void> {
 }
 
 export async function clearSession(): Promise<void> {
-  await Promise.all([K.DEMO_TOKEN, K.IM_TOKEN, K.IM_TOKEN_EXPIRES_AT, K.PROFILE].map(k => AsyncStorage.removeItem(k)))
+  await Promise.all([K.DEMO_TOKEN, K.IM_TOKEN, K.PROFILE].map(k => AsyncStorage.removeItem(k)))
 }