diff --git a/src/core/sdk.ts b/src/core/sdk.ts
index bb3f2bf..46d3d2d 100644
--- a/src/core/sdk.ts
+++ b/src/core/sdk.ts
@@ -28,6 +28,16 @@ export function getUserId(): string | null {
   return _userId
 }
 
+export function login(userId: string, userSig: string): void {
+  setToken(userSig)
+  setUserId(userId)
+}
+
+export function logout(): void {
+  setToken(null)
+  setUserId(null)
+}
+
 export function getConfig(): SDKConfig {
   if (!_config) throw new Error('XuqmSDK not initialized. Call init() first.')
   return _config
diff --git a/src/index.ts b/src/index.ts
index 267c85a..7b5aa2c 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,4 +1,4 @@
-export { init, setToken, setUserId, getToken, getUserId, getConfig } from './core/sdk'
+export { init, login, logout, setToken, setUserId, getToken, getUserId, getConfig } from './core/sdk'
 export { http } from './core/http'
 export { ImClient } from './im/ImClient'
 export {