diff --git a/lib/cmd/test.js b/lib/cmd/test.js
index 8b15ef43..e4b73f4d 100644
--- a/lib/cmd/test.js
+++ b/lib/cmd/test.js
@@ -69,6 +69,7 @@ class TestCommand extends Command {
     /* istanbul ignore next */
     if (!Array.isArray(requireArr)) requireArr = [ requireArr ];
 
+    requireArr.unshift(require.resolve('../mocha-clean'));
     requireArr.push(require.resolve('co-mocha'));
 
     if (requireArr.includes('intelli-espower-loader')) {
diff --git a/lib/mocha-clean.js b/lib/mocha-clean.js
new file mode 100644
index 00000000..10ade833
--- /dev/null
+++ b/lib/mocha-clean.js
@@ -0,0 +1,27 @@
+// inspired by https://github.com/rstacruz/mocha-clean
+
+'use strict';
+
+const mocha = require('mocha');
+const internal = [
+  '(timers.js:',
+  '(node.js:',
+  '(module.js:',
+  '(domain.js:',
+  'GeneratorFunctionPrototype.next (native)',
+  '__mocha_internal__',
+  'node_modules',
+];
+
+// monkey-patch `Runner#fail` to modify stack
+const originFn = mocha.Runner.prototype.fail;
+mocha.Runner.prototype.fail = function(test, err) {
+  if (err.stack) {
+    const stack = err.stack.split('\n').filter(line => {
+      // console.log(!internal.some(key => line.includes(key)), line);
+      return !internal.some(key => line.includes(key));
+    });
+    err.stack = stack.join('\n');
+  }
+  return originFn.call(this, test, err);
+};
diff --git a/package.json b/package.json
index bc2cf8ea..2daef457 100644
--- a/package.json
+++ b/package.json
@@ -12,14 +12,14 @@
     "co-mocha": "^1.2.0",
     "common-bin": "^2.4.0",
     "debug": "^2.6.8",
-    "detect-port": "^1.1.3",
+    "detect-port": "^1.2.0",
     "egg-utils": "^2.2.0",
     "globby": "^6.1.0",
     "intelli-espower-loader": "^1.0.1",
     "istanbul": "^1.1.0-alpha.1",
     "mocha": "^3.4.2",
     "mz-modules": "^1.0.0",
-    "power-assert": "^1.4.2",
+    "power-assert": "^1.4.3",
     "ypkgfiles": "^1.4.0"
   },
   "devDependencies": {
diff --git a/test/fixtures/test-files/test/clean.test.js b/test/fixtures/test-files/test/clean.test.js
new file mode 100644
index 00000000..73a39583
--- /dev/null
+++ b/test/fixtures/test-files/test/clean.test.js
@@ -0,0 +1,9 @@
+'use strict';
+
+describe('clean.test.js', () => {
+  it('should fail with simplify stack', () => {
+    [ 1 ].forEach(() => {
+      throw new Error('clean.test.js throw');
+    });
+  });
+});
diff --git a/test/lib/cmd/test.test.js b/test/lib/cmd/test.test.js
index 45309cb6..a2a9455c 100644
--- a/test/lib/cmd/test.test.js
+++ b/test/lib/cmd/test.test.js
@@ -3,6 +3,7 @@
 const path = require('path');
 const coffee = require('coffee');
 const mm = require('mm');
+const assert = require('assert');
 
 describe('test/lib/cmd/test.test.js', () => {
   const eggBin = require.resolve('../../../bin/egg-bin.js');
@@ -22,6 +23,19 @@ describe('test/lib/cmd/test.test.js', () => {
       .end(done);
   });
 
+  it('should clean mocha error stack', done => {
+    coffee.fork(eggBin, [ 'test', 'test/clean.test.js' ], { cwd })
+      // .debug()
+      .end((err, { stdout, code }) => {
+        assert(stdout.includes('Error: clean.test.js throw'));
+        assert(stdout.match(/at forEach.*clean\.test\.js:6:13/));
+        assert(stdout.match(/at Context\.it.*clean\.test\.js:5:11/));
+        assert(stdout.match(/\bat\s+/g).length === 3);
+        assert(code === 1);
+        done(err);
+      });
+  });
+
   it('should ignore node_modules and fixtures', done => {
     mm(process.env, 'TESTS', 'test/**/*.test.js');
     coffee.fork(eggBin, [ 'test' ], { cwd: path.join(__dirname, '../../fixtures/test-files-glob') })