diff --git a/README.md b/README.md
index d3131afd..4315c9b4 100644
--- a/README.md
+++ b/README.md
@@ -78,7 +78,7 @@ $ egg-bin debug
 
 Using [mocha] with [thunk-mocha] to run test.
 
-[power-assert] is recommend to used as `assert` library, and [intelli-espower-loader] will be auotoload.
+[power-assert] is the default `assert` library, and [intelli-espower-loader] will be auotoload.
 
 You can set `TESTS` env to set the tests directory, it support [glob] grammar.
 
@@ -197,4 +197,4 @@ run nsp check at /foo/bar with []
 [nsp]: https://npmjs.com/thunk-mocha
 [iron-node]: https://github.com/s-a/iron-node
 [intelli-espower-loader]: https://github.com/power-assert-js/intelli-espower-loader
-[power-assert]: https://github.com/power-assert-js/power-assert
\ No newline at end of file
+[power-assert]: https://github.com/power-assert-js/power-assert
diff --git a/README.zh-CN.md b/README.zh-CN.md
index 11a1cf8a..f9334047 100644
--- a/README.zh-CN.md
+++ b/README.zh-CN.md
@@ -72,7 +72,8 @@ $ egg-bin debug
 
 测试工具，使用 [mocha]，支持 [thunk-mocha] 扩展。
 
-内置了 [intelli-espower-loader] 并推荐使用 [power-assert] 作为断言库, 具体参见 https://github.com/atian25/blog/issues/16
+内置了 [intelli-espower-loader] 并使用 [power-assert] 作为断言库，具体参见 https://github.com/atian25/blog/issues/16 。
+在测试代码中只需要 `require('assert')` 即可享受 [power-assert] 带来的体验提升。
 
 可通过 `TESTS` 环境变量指定具体文件，支持 [glob]。
 
diff --git a/package.json b/package.json
index 96e5f1e9..1f2293bf 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,7 @@
     "istanbul": "^0.4.5",
     "mkdirp": "^0.5.1",
     "mocha": "^3.2.0",
+    "power-assert": "^1.4.2",
     "rimraf": "^2.5.4",
     "semver": "^5.3.0",
     "thunk-mocha": "^1.0.8"
@@ -28,8 +29,7 @@
     "egg-ci": "^1.1.0",
     "eslint": "^3.12.1",
     "eslint-config-egg": "^3.2.0",
-    "mm": "^2.0.0",
-    "power-assert": "^1.4.2"
+    "mm": "^2.0.0"
   },
   "repository": {
     "type": "git",
diff --git a/test/egg-cov.test.js b/test/egg-cov.test.js
index 4e0a4387..e987d8e5 100644
--- a/test/egg-cov.test.js
+++ b/test/egg-cov.test.js
@@ -2,7 +2,7 @@
 
 const fs = require('fs');
 const path = require('path');
-const assert = require('power-assert');
+const assert = require('assert');
 const coffee = require('coffee');
 const mm = require('mm');
 
diff --git a/test/egg-test.test.js b/test/egg-test.test.js
index 21e24fdf..55e0da7f 100644
--- a/test/egg-test.test.js
+++ b/test/egg-test.test.js
@@ -1,7 +1,7 @@
 'use strict';
 
 const path = require('path');
-const assert = require('power-assert');
+const assert = require('assert');
 const coffee = require('coffee');
 const mm = require('mm');
 
@@ -20,7 +20,7 @@ describe('egg-bin test', () => {
     .expect('code', 0)
     .end((err, res) => {
       assert.ifError(err);
-      assert.ok(!/a\.js/.test(res.stdout));
+      assert(!/a\.js/.test(res.stdout));
       done();
     });
   });
diff --git a/test/my-egg-bin.test.js b/test/my-egg-bin.test.js
index 4b835f15..29beec1a 100644
--- a/test/my-egg-bin.test.js
+++ b/test/my-egg-bin.test.js
@@ -1,7 +1,7 @@
 'use strict';
 
 const path = require('path');
-const assert = require('power-assert');
+const assert = require('assert');
 const coffee = require('coffee');
 const mm = require('mm');