diff --git a/lib/cmd/test.js b/lib/cmd/test.js
index 294443d1..33317d79 100644
--- a/lib/cmd/test.js
+++ b/lib/cmd/test.js
@@ -40,7 +40,6 @@ class TestCommand extends Command {
     const opt = {
       env: Object.assign({
         NODE_ENV: 'test',
-        EGG_TYPESCRIPT: context.argv.typescript,
       }, context.env),
       execArgv: context.execArgv,
     };
diff --git a/lib/command.js b/lib/command.js
index 544e32b7..9bcb1e4b 100644
--- a/lib/command.js
+++ b/lib/command.js
@@ -26,7 +26,7 @@ class Command extends BaseCommand {
 
   get context() {
     const context = super.context;
-    const { argv, debugPort, execArgvObj, cwd } = context;
+    const { argv, debugPort, execArgvObj, cwd, env } = context;
 
     // compatible
     if (debugPort) context.debug = debugPort;
@@ -51,6 +51,7 @@ class Command extends BaseCommand {
     if (argv.typescript) {
       execArgvObj.require = execArgvObj.require || [];
       execArgvObj.require.push(path.join(__dirname, './ts-helper.js'));
+      env.EGG_TYPESCRIPT = true;
     }
 
     return context;
diff --git a/test/fixtures/example-ts-pkg/app.ts b/test/fixtures/example-ts-pkg/app.ts
index a063672b..b9d7d67c 100644
--- a/test/fixtures/example-ts-pkg/app.ts
+++ b/test/fixtures/example-ts-pkg/app.ts
@@ -4,4 +4,5 @@ import { Application } from 'egg';
 
 export default (app: Application) => {
   console.log(`hi, egg, ${app.config.keys}`);
+  console.log(`ts env: ${process.env.EGG_TYPESCRIPT}`);
 };
diff --git a/test/fixtures/example-ts/app.ts b/test/fixtures/example-ts/app.ts
index a063672b..b9d7d67c 100644
--- a/test/fixtures/example-ts/app.ts
+++ b/test/fixtures/example-ts/app.ts
@@ -4,4 +4,5 @@ import { Application } from 'egg';
 
 export default (app: Application) => {
   console.log(`hi, egg, ${app.config.keys}`);
+  console.log(`ts env: ${process.env.EGG_TYPESCRIPT}`);
 };
diff --git a/test/ts.test.js b/test/ts.test.js
index bff49e3d..e914bd80 100644
--- a/test/ts.test.js
+++ b/test/ts.test.js
@@ -47,6 +47,7 @@ describe('test/ts.test.js', () => {
       return coffee.fork(eggBin, [ 'dev', '--ts' ], { cwd })
         // .debug()
         .expect('stdout', /hi, egg, 12345/)
+        .expect('stdout', /ts env: true/)
         .expect('stdout', /started/)
         .expect('code', 0)
         .end();
@@ -56,6 +57,7 @@ describe('test/ts.test.js', () => {
       return coffee.fork(eggBin, [ 'test', '--ts' ], { cwd })
         // .debug()
         .expect('stdout', /hi, egg, 123456/)
+        .expect('stdout', /ts env: true/)
         .expect('stdout', /should work/)
         .expect('code', 0)
         .end();
@@ -65,6 +67,7 @@ describe('test/ts.test.js', () => {
       return coffee.fork(eggBin, [ 'cov', '--ts' ], { cwd })
         // .debug()
         .expect('stdout', /hi, egg, 123456/)
+        .expect('stdout', /ts env: true/)
         .expect('stdout', process.env.NYC_ROOT_ID ? /Coverage summary/ : /Statements.*100%/)
         .expect('code', 0)
         .end();
@@ -85,6 +88,7 @@ describe('test/ts.test.js', () => {
       return coffee.fork(eggBin, [ 'dev' ], { cwd })
         // .debug()
         .expect('stdout', /hi, egg, 12345/)
+        .expect('stdout', /ts env: true/)
         .expect('stdout', /started/)
         .expect('code', 0)
         .end();
@@ -103,6 +107,7 @@ describe('test/ts.test.js', () => {
       return coffee.fork(eggBin, [ 'dev', './example-ts-pkg' ], { cwd: path.dirname(cwd) })
         // .debug()
         .expect('stdout', /hi, egg, 12345/)
+        .expect('stdout', /ts env: true/)
         .expect('stdout', /started/)
         .expect('code', 0)
         .end();
@@ -112,6 +117,7 @@ describe('test/ts.test.js', () => {
       return coffee.fork(eggBin, [ 'test' ], { cwd })
         // .debug()
         .expect('stdout', /hi, egg, 123456/)
+        .expect('stdout', /ts env: true/)
         .expect('code', 0)
         .end();
     });
@@ -120,6 +126,7 @@ describe('test/ts.test.js', () => {
       return coffee.fork(eggBin, [ 'cov' ], { cwd })
         .debug()
         .expect('stdout', /hi, egg, 123456/)
+        .expect('stdout', /ts env: true/)
         .expect('stdout', process.env.NYC_ROOT_ID ? /Coverage summary/ : /Statements.*100%/)
         .expect('code', 0)
         .end();