diff --git a/index.js b/index.js
index b3a27bc..273db96 100644
--- a/index.js
+++ b/index.js
@@ -324,9 +324,10 @@ module.exports = {
     return null
   }
   ,
-  randomSecword:function(lang){ // Object.keys(Secword.Words) => [ 'CHINESE', 'ENGLISH', 'FRENCH', 'ITALIAN', 'JAPANESE', 'SPANISH' ]
-    lang = (lang && Secword.Words.hasOwnProperty(lang.toUpperCase())) ? lang.toUpperCase() : 'ENGLISH'
-    return new Secword(Secword.Words[lang]).phrase
+  randomSecword:function(lang='ENGLISH'){ // Object.keys(Secword.Words) => [ 'CHINESE', 'ENGLISH', 'FRENCH', 'ITALIAN', 'JAPANESE', 'SPANISH' ]
+    let language = { zhCN: 'CHINESE', enUS: 'ENGLISH', frFR: 'FRENCH', itIT: 'ITALIAN', jaJP: 'JAPANESE', esES: 'SPANISH' }[lang]
+      || (Secword.Words.hasOwnProperty(lang.toUpperCase()) ? lang.toUpperCase() : 'ENGLISH')
+    return new Secword(Secword.Words[language]).phrase
   }
   ,
   randomSeckey:function(option){