diff --git a/README.md b/README.md
index 62b3f2ac..ea727f90 100644
--- a/README.md
+++ b/README.md
@@ -227,8 +227,7 @@ Param          | Type           | Description
 -------------- | -------------- | ------------------------
 directory      | `String/Array` | directories to be loaded
 target         | `Object`       | attach the target object from loaded files
-match          | `String/Array` | match the files when load, default to `**/*.js`(if typescript was true, default to `[ '**/*.(js|ts)', '!**/*.d.ts' ]`)
-typescript     | `Boolean`      | whether support typescript
+match          | `String/Array` | match the files when load, default to `**/*.js`(if process.env.EGG_TYPESCRIPT was true, default to `[ '**/*.(js|ts)', '!**/*.d.ts' ]`)
 ignore         | `String/Array` | ignore the files when load
 initializer    | `Function`     | custom file exports, receive two parameters, first is the inject object(if not js file, will be content buffer), second is an `options` object that contain `path`
 caseStyle      | `String/Function` | set property's case when converting a filepath to property list.
diff --git a/lib/loader/egg_loader.js b/lib/loader/egg_loader.js
index f9fc35ae..532a45ae 100644
--- a/lib/loader/egg_loader.js
+++ b/lib/loader/egg_loader.js
@@ -18,7 +18,6 @@ class EggLoader {
    * @constructor
    * @param {Object} options - options
    * @param {String} options.baseDir - the directory of application
-   * @param {Boolean} options.typescript - whether support typescript
    * @param {EggCore} options.app - Application instance
    * @param {Logger} options.logger - logger
    * @param {Object} [options.plugins] - custom plugins
@@ -30,10 +29,6 @@ class EggLoader {
     assert(this.options.app, 'options.app is required');
     assert(this.options.logger, 'options.logger is required');
 
-    if (options.typescript && !require.extensions['.ts']) {
-      this.options.logger.warn('[egg:loader] `require.extensions` should contains `.ts` while `options.typescript` was true');
-    }
-
     this.app = this.options.app;
 
     /**
@@ -359,7 +354,6 @@ class EggLoader {
       directory,
       target,
       inject: this.app,
-      typescript: this.options.typescript,
     }, opt);
     new FileLoader(opt).load();
   }
@@ -376,7 +370,6 @@ class EggLoader {
       directory,
       property,
       inject: this.app,
-      typescript: this.options.typescript,
     }, opt);
     new ContextLoader(opt).load();
   }
@@ -415,7 +408,7 @@ class EggLoader {
       return undefined;
     }
 
-    if (!this.options.typescript && fullPath.endsWith('.ts')) {
+    if (process.env.EGG_TYPESCRIPT !== 'true' && fullPath.endsWith('.ts')) {
       return undefined;
     }
 
diff --git a/lib/loader/file_loader.js b/lib/loader/file_loader.js
index f88b00f7..a38978bc 100644
--- a/lib/loader/file_loader.js
+++ b/lib/loader/file_loader.js
@@ -15,7 +15,6 @@ const defaults = {
   directory: null,
   target: null,
   match: undefined,
-  typescript: false,
   ignore: undefined,
   lowercaseFirst: false,
   caseStyle: 'camel',
@@ -38,7 +37,6 @@ class FileLoader {
    * @param {String|Array} options.directory - directories to be loaded
    * @param {Object} options.target - attach the target object from loaded files
    * @param {String} options.match - match the files when load, support glob, default to all js files
-   * @param {Boolean} options.typescript - whether support typescript, default to false
    * @param {String} options.ignore - ignore the files when load, support glob
    * @param {Function} options.initializer - custom file exports, receive two parameters, first is the inject object(if not js file, will be content buffer), second is an `options` object that contain `path`
    * @param {Boolean} options.call - determine whether invoke when exports is function
@@ -124,7 +122,7 @@ class FileLoader {
   parse() {
     let files = this.options.match;
     if (!files) {
-      files = (this.options.typescript && require.extensions['.ts'])
+      files = (process.env.EGG_TYPESCRIPT === 'true' && require.extensions['.ts'])
         ? [ '**/*.(js|ts)', '!**/*.d.ts' ]
         : [ '**/*.js' ];
     } else {
diff --git a/test/egg-ts.test.js b/test/egg-ts.test.js
index 8cb072d0..dfd0d490 100644
--- a/test/egg-ts.test.js
+++ b/test/egg-ts.test.js
@@ -1,5 +1,6 @@
 'use strict';
 
+const mm = require('mm');
 const request = require('supertest');
 const assert = require('assert');
 const utils = require('./utils');
@@ -12,13 +13,13 @@ describe('test/egg-ts.test.js', () => {
   });
 
   afterEach(() => {
+    mm.restore();
     delete require.extensions['.ts'];
   });
 
   it('should support load ts file', async () => {
-    app = utils.createApp('egg-ts', {
-      typescript: true,
-    });
+    mm(process.env, 'EGG_TYPESCRIPT', 'true');
+    app = utils.createApp('egg-ts');
 
     app.Helper = class Helper {};
     app.loader.loadPlugin();
@@ -57,9 +58,8 @@ describe('test/egg-ts.test.js', () => {
   });
 
   it('should not load d.ts files while typescript was true', async () => {
-    app = utils.createApp('egg-ts-js', {
-      typescript: true,
-    });
+    mm(process.env, 'EGG_TYPESCRIPT', 'true');
+    app = utils.createApp('egg-ts-js');
 
     app.loader.loadController();
     assert(!app.controller.god);
@@ -67,16 +67,15 @@ describe('test/egg-ts.test.js', () => {
   });
 
   it('should support load ts,js files', async () => {
-    app = utils.createApp('egg-ts-js', {
-      typescript: true,
-    });
+    mm(process.env, 'EGG_TYPESCRIPT', 'true');
+    app = utils.createApp('egg-ts-js');
 
     app.loader.loadService();
     assert(app.serviceClasses.lord);
     assert(app.serviceClasses.test);
   });
 
-  it('should not load ts files while typescript was false', async () => {
+  it('should not load ts files while EGG_TYPESCRIPT was not exist', async () => {
     app = utils.createApp('egg-ts-js');
 
     app.loader.loadApplicationExtend();
@@ -86,9 +85,10 @@ describe('test/egg-ts.test.js', () => {
     assert(!app.serviceClasses.test);
   });
 
-  it('should not load ts files while typescript was true but no extensions', async () => {
+  it('should not load ts files while EGG_TYPESCRIPT was true but no extensions', async () => {
+    mm(process.env, 'EGG_TYPESCRIPT', 'true');
     delete require.extensions['.ts'];
-    app = utils.createApp('egg-ts-js', { typescript: true });
+    app = utils.createApp('egg-ts-js');
 
     app.loader.loadApplicationExtend();
     app.loader.loadService();
diff --git a/test/loader/egg_loader.test.js b/test/loader/egg_loader.test.js
index 1727d257..1eab642a 100644
--- a/test/loader/egg_loader.test.js
+++ b/test/loader/egg_loader.test.js
@@ -39,13 +39,5 @@ describe('test/loader/egg_loader.test.js', () => {
       mm(process.env, 'EGG_HOME', '/path/to/home');
       assert(app.loader.getHomedir() === '/path/to/home');
     });
-
-    it('should warning when typescript was true but no ts extension', done => {
-      mm(process.stdout, 'write', msg => {
-        assert(msg.includes('`require.extensions` should contains `.ts` while `options.typescript` was true'));
-        done();
-      });
-      utils.createApp('nothing', { typescript: true });
-    });
   });
 });