diff --git a/bin/cli.js b/bin/cli.js
index 054cfb1..b39c558 100755
--- a/bin/cli.js
+++ b/bin/cli.js
@@ -96,7 +96,7 @@ program
   .option('--server [port]', 'start http server')
   .option('--speed', 'stat webpack build speed')
   .description('webpack building')
-  .action((env, options) => {
+  .action((env = 'prod', options) => {
     const config = utils.initWebpackConfig(program, { env, cliDevtool: options.devtool }, { speed: options.speed });
     // 编译完成, 启动 HTTP Server 访问静态页面
     if (options.server) {
diff --git a/lib/utils.js b/lib/utils.js
index 3aa627c..3117de5 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -90,7 +90,7 @@ module.exports = {
   },
 
   initWebpackConfig(program, option = {}, cliConfig = {}) {
-    const { baseDir = process.cwd(), env = 'prod' } = option;
+    const { baseDir = process.cwd(), env } = option;
     const { filename, port, framework, type, devtool, size, watch, build, hash, compress, dll, web, node, webpack } = program;
     const target = web ? 'web' : (node ? 'node' : undefined);
     const cli = merge({ env, filename, port, size, dll, web, node, webpack }, cliConfig);
diff --git a/package.json b/package.json
index 214c92b..4da3896 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "easywebpack-cli",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "description": "Webpack Building Command Line And Boilerplate Init Tool",
   "bin": {
     "easywebpack": "bin/cli.js",