diff --git a/src/index.js b/src/index.js
index 98208c45c96f2f8e954b440bc7eb241d4a3a7aa2..77fcd5a8d161b291842eb94cd9df749014d6edb8 100644
--- a/src/index.js
+++ b/src/index.js
@@ -93,6 +93,17 @@ class UniID {
     if (this._clientInfo.platform === 'h5') {
       this._clientInfo.platform = 'web'
     }
+    let fallbackPlatform
+    switch (this._clientInfo.platform) {
+      case 'web':
+        fallbackPlatform = 'h5'
+        break
+      case 'app':
+        fallbackPlatform = 'app-plus'
+        break
+      default:
+        break
+    }
     const defaultConfig = {
       tokenExpiresIn: 7200,
       tokenExpiresThreshold: 1200,
@@ -100,7 +111,12 @@ class UniID {
       passwordErrorRetryTime: 3600
     }
     const argsRequired = ['tokenSecret', 'tokenExpiresIn']
-    const config = Object.assign(defaultConfig, appConfig, appConfig[this._clientInfo.platform])
+    const configList = [defaultConfig, appConfig]
+    if (fallbackPlatform && appConfig[fallbackPlatform]) {
+      configList.push(appConfig[fallbackPlatform])
+    }
+    configList.push(appConfig[this._clientInfo.platform])
+    const config = Object.assign(...configList)
     argsRequired.forEach((item) => {
       if (!config || !config[item]) {
         throw new Error(`Config parameter missing, ${item} is required`)