diff --git a/envar-tool.js b/envar-tool.js
index 82b46f6..9c2a0c9 100644
--- a/envar-tool.js
+++ b/envar-tool.js
@@ -1,6 +1,5 @@
 const fs = require('fs')
 const path = require('path')
-const commander = require('commander')
 const deepmerge = require('deepmerge')
 
 module.exports = {
@@ -57,22 +56,27 @@ module.exports = {
         console.warn(`  - unrecognized envarFiles!`)
       }
 
-      if (Array.isArray(global.envar.commanderOptions)) {
-        console.info('- Loading Command Line Parameters (载入命令行参数)')
-        commander.version(global.envar.Base_Version || '0.0.1', '-v, --version') // 默认是 -V。如果要 -v，就要加 '-v --version'
-        for (let [key, param, desc] of global.envar.commanderOptions || []) {
-          commander.option(param, `${desc} Default = "${global.envar[key]}"`)
-        }
-        commander.parse(process.argv)
-        delete global.envar.commanderOptions
+      try {
+        const commander = require('commander')
+        if (Array.isArray(global.envar.commanderOptions)) {
+          console.info('- Loading Command Line Parameters (载入命令行参数)')
+          commander.version(global.envar.Base_Version || '0.0.1', '-v, --version') // 默认是 -V。如果要 -v，就要加 '-v --version'
+          for (let [key, param, desc] of global.envar.commanderOptions || []) {
+            commander.option(param, `${desc} Default = "${global.envar[key]}"`)
+          }
+          commander.parse(process.argv)
+          delete global.envar.commanderOptions
 
-        // console.log('- Merging Command Line Parameters into Configuration (把命令行参数值合并入配置)')
-        for (let key in commander) {
-          if (!/^_/.test(key) && typeof commander[key] === 'string') {
-            // commander 自带了一批 _开头的属性，过滤掉
-            global.envar[key] = commander[key]
+          // console.log('- Merging Command Line Parameters into Configuration (把命令行参数值合并入配置)')
+          for (let key in commander) {
+            if (!/^_/.test(key) && typeof commander[key] === 'string') {
+              // commander 自带了一批 _开头的属性，过滤掉
+              global.envar[key] = commander[key]
+            }
           }
         }
+      } catch (e) {
+        console.error('  - commander not available!')
       }
 
       console.log(`>>>>>>>> Configured [${global.envar.prodev}] Variables >>>>>>>>`)