diff --git a/.gitignore b/.gitignore
index 2840708..9b0a993 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,5 +3,6 @@ npm-debug.log
 _book/
 demo/*/node_modules
 demo/*/npm-debug.log
+demo/*/package-lock.json
 demo/*/upload-files/
 demo/upload-async/static/image/
diff --git a/demo/esm/custom-loader.mjs b/demo/esm/custom-loader.mjs
new file mode 100644
index 0000000..2678fbf
--- /dev/null
+++ b/demo/esm/custom-loader.mjs
@@ -0,0 +1,72 @@
+import url from 'url';
+import path from 'path';
+import process from 'process';
+import fs from 'fs';
+
+// 从package.json中
+// 的dependencies、devDependencies获取项目所需npm模块信息
+const ROOT_PATH = process.cwd();
+const PKG_JSON_PATH = path.join( ROOT_PATH, 'package.json' );
+const PKG_JSON_STR = fs.readFileSync(PKG_JSON_PATH, 'binary');
+const PKG_JSON = JSON.parse(PKG_JSON_STR);
+// 项目所需npm模块信息
+const allDependencies = {
+  ...PKG_JSON.dependencies || {},
+  ...PKG_JSON.devDependencies || {}
+}
+
+//Node原生模信息
+const builtins = new Set(
+  Object.keys(process.binding('natives')).filter((str) =>
+    /^(?!(?:internal|node|v8)\/)/.test(str))
+);
+
+// 文件引用兼容后缀名
+const JS_EXTENSIONS = new Set(['.js', '.mjs']);
+const JSON_EXTENSIONS = new Set(['.json']);
+
+export function resolve(specifier, parentModuleURL, defaultResolve) {
+  // 判断是否为Node原生模块
+  if (builtins.has(specifier)) {
+    return {
+      url: specifier,
+      format: 'builtin'
+    };
+  }
+
+  // 判断是否为npm模块
+  if ( allDependencies && typeof allDependencies[specifier] === 'string' ) {
+    return defaultResolve(specifier, parentModuleURL);
+  }
+
+  // 如果是文件引用，判断是否路径格式正确
+  if (/^\.{0,2}[/]/.test(specifier) !== true && !specifier.startsWith('file:')) { 
+    throw new Error(
+      `imports must begin with '/', './', or '../'; '${specifier}' does not`);
+  }
+
+  // 判断是否为*.js、*.mjs、*.json文件
+  const resolved = new url.URL(specifier, parentModuleURL);
+  const ext = path.extname(resolved.pathname);
+  if (!JS_EXTENSIONS.has(ext) && !JSON_EXTENSIONS.has(ext)) {
+    throw new Error(
+      `Cannot load file with non-JavaScript file extension ${ext}.`);
+  }
+
+  // 如果是*.js、*.mjs文件
+  if (JS_EXTENSIONS.has(ext)) {
+    return {
+      url: resolved.href,
+      format: 'esm'
+    };
+  }
+  
+  // 如果是*.json文件
+  if (JSON_EXTENSIONS.has(ext)) {
+    return {
+      url: resolved.href,
+      format: 'json'
+    };
+  }
+
+}
\ No newline at end of file
diff --git a/demo/esm/index.js b/demo/esm/index.js
new file mode 100644
index 0000000..28e7504
--- /dev/null
+++ b/demo/esm/index.js
@@ -0,0 +1,20 @@
+import Koa from 'koa';
+import { render } from './lib/render.js';
+import data from './lib/data.json';
+
+let app = new Koa();
+app.use((ctx, next) => {
+    let view = ctx.url.substr(1);
+    let content;
+    if ( view === '' ) {
+        content = render('index');
+    } else if ( view === 'data' ) {
+        content = data;
+    } else {
+        content = render(view);
+    }
+    ctx.body = content;
+})
+app.listen(3000, ()=>{
+    console.log('the modules test server is starting');
+})
\ No newline at end of file
diff --git a/demo/esm/lib/data.json b/demo/esm/lib/data.json
new file mode 100644
index 0000000..126283b
--- /dev/null
+++ b/demo/esm/lib/data.json
@@ -0,0 +1,4 @@
+{
+    "title": "hello ES6 Modules",
+    "name": "ES6"
+}
\ No newline at end of file
diff --git a/demo/esm/lib/path.js b/demo/esm/lib/path.js
new file mode 100644
index 0000000..77c4799
--- /dev/null
+++ b/demo/esm/lib/path.js
@@ -0,0 +1,3 @@
+import process from 'process';
+
+export const PROJECT_PATH = process.cwd();
\ No newline at end of file
diff --git a/demo/esm/lib/render.js b/demo/esm/lib/render.js
new file mode 100644
index 0000000..8ed9589
--- /dev/null
+++ b/demo/esm/lib/render.js
@@ -0,0 +1,12 @@
+import { PROJECT_PATH } from './path.js';
+import fs from 'fs';
+import path from 'path'
+
+export const render = ( view ) => {
+    let viewPath = path.join(PROJECT_PATH, 'view',`${view}.html`);
+    if ( fs.existsSync(viewPath) ) {
+        return fs.readFileSync(viewPath, 'binary');
+    } else {
+        return `Error: file ${view}.html is not found!`;
+    }
+}
\ No newline at end of file
diff --git a/demo/esm/package.json b/demo/esm/package.json
new file mode 100644
index 0000000..3ce1d45
--- /dev/null
+++ b/demo/esm/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "demo1",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "node --experimental-modules  --loader ./custom-loader.mjs ./index.js"
+  },
+  "author": "",
+  "license": "MIT",
+  "engines": {
+    "node": ">= 9.0.0"
+  },
+  "dependencies": {
+    "koa": "^2.4.1"
+  },
+  "devDependencies": {
+    "eslint": "^4.11.0"
+  }
+}
diff --git a/demo/esm/view/helloworld.html b/demo/esm/view/helloworld.html
new file mode 100644
index 0000000..f52c9e0
--- /dev/null
+++ b/demo/esm/view/helloworld.html
@@ -0,0 +1,8 @@
+<html>
+    <head>
+        <title>hello world</title>
+    </head>
+    <body>
+        <h1>hello world page</h1>
+    </body>
+</html>
\ No newline at end of file
diff --git a/demo/esm/view/index.html b/demo/esm/view/index.html
new file mode 100644
index 0000000..8d65f66
--- /dev/null
+++ b/demo/esm/view/index.html
@@ -0,0 +1,19 @@
+<html>
+    <head>
+        <title>index</title>
+    </head>
+    <body>
+        <h1>hello world</h1>
+        <ul>
+            <li>
+                <a href="http://127.0.0.1:3000/index">http://127.0.0.1:3000/index</a>
+            </li>
+            <li>
+                <a href="http://127.0.0.1:3000/helloworld">http://127.0.0.1:3000/helloworld</a>
+            </li>
+            <li>
+                <a href="http://127.0.0.1:3000/todo">http://127.0.0.1:3000/todo</a>
+            </li>
+        </ul>
+    </body>
+</html>
\ No newline at end of file
diff --git a/demo/esm/view/todo.html b/demo/esm/view/todo.html
new file mode 100644
index 0000000..ef290c5
--- /dev/null
+++ b/demo/esm/view/todo.html
@@ -0,0 +1,8 @@
+<html>
+    <head>
+        <title>todo</title>
+    </head>
+    <body>
+        <h1>todo page</h1>
+    </body>
+</html>
\ No newline at end of file