diff --git a/src/core/sdk.ts b/src/core/sdk.ts
index 46d3d2d..0b737e1 100644
--- a/src/core/sdk.ts
+++ b/src/core/sdk.ts
@@ -1,15 +1,61 @@
 import type { SDKConfig } from '../types'
 import { configureHttp } from './http'
-import { DEFAULT_API_BASE_URL } from './endpoints'
+import { DEFAULT_API_BASE_URL, DEFAULT_IM_WS_URL } from './endpoints'
 
 let _config: SDKConfig | null = null
 let _token: string | null = null
 let _userId: string | null = null
+let _initialized = false
+let _initPromise: Promise<void> | null = null
+let _initResolve: (() => void) | null = null
+
+function ensureInitPromise(): Promise<void> {
+  if (!_initPromise) {
+    _initPromise = new Promise((resolve) => { _initResolve = resolve })
+  }
+  return _initPromise
+}
+
+function markInitialized(): void {
+  _initialized = true
+  if (_initResolve) {
+    _initResolve()
+    _initResolve = null
+  }
+}
+
+export function isInitialized(): boolean {
+  return _initialized
+}
 
 export function init(config: SDKConfig) {
+  if (_initialized) return
   _config = config
   configureHttp(config.baseUrl || DEFAULT_API_BASE_URL, () => _token)
   if (config.debug) console.log('[XuqmSDK] initialized', config.appKey, 'baseUrl=', config.baseUrl || DEFAULT_API_BASE_URL)
+  markInitialized()
+}
+
+export function initializeFromLicense(
+  file: { appKey: string; baseUrl?: string; serverUrl?: string },
+  options?: { debug?: boolean },
+): void {
+  if (_initialized) return
+  const serverUrl = file.serverUrl || file.baseUrl || DEFAULT_API_BASE_URL
+  _config = {
+    appKey: file.appKey,
+    debug: options?.debug,
+    baseUrl: serverUrl,
+    wsUrl: serverUrl.replace(/^https/, 'wss') + '/ws/im',
+  }
+  configureHttp(serverUrl, () => _token)
+  if (options?.debug) console.log('[XuqmSDK] initialized from license', file.appKey, 'baseUrl=', serverUrl)
+  markInitialized()
+}
+
+export async function awaitInitialization(): Promise<void> {
+  if (_initialized) return
+  await ensureInitPromise()
 }
 
 export function setToken(token: string | null) {
diff --git a/src/index.ts b/src/index.ts
index 71e43c2..b46a16f 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,4 +1,4 @@
-export { init, login, logout, setToken, setUserId, getToken, getUserId, getConfig } from './core/sdk'
+export { init, login, logout, setToken, setUserId, getToken, getUserId, getConfig, isInitialized, awaitInitialization, initializeFromLicense } from './core/sdk'
 export { http, uploadFile } from './core/http'
 export { ImClient } from './im/ImClient'
 export { ImManager } from './im/ImManager'