diff --git a/README-zh.md b/README-zh.md
new file mode 100644
index 0000000..907827d
--- /dev/null
+++ b/README-zh.md
@@ -0,0 +1,160 @@
+# Kotlin cloudflare worker
+
+纯Kotlin编写的库，可以在Cloudflare worker上运行Kotlin/JS
+
+# 快速开始
+
+## 配置
+
+> 项目依赖于Kotlin协程库, 请确保协程库版本号大于`1.10.2`
+
+```kotlin
+plugins {
+    kotlin("multiplatform") version "2.2.21"
+}
+
+repositories {
+    mavenCentral()
+    maven("https://repo.maven.rtast.cn/releases")
+}
+```
+
+```kotlin
+// 最新版本请前往下方链接查看
+// https://next.pkg.rtast.cn/#/releases/cn/rtast/kotlin-cfworker/kotlin-cloudflare-worker/
+implementation("cn.rtast.kotlin-cfworker:kotlin-cloudflare-worker:1.0.2")
+```
+
+## Hello world程序
+
+```kotlin
+kotlin {
+    js(IR) {
+        nodejs {
+            outputModuleName = "kotlin-cloudflare-worker"
+            binaries.executable()
+        }
+    }
+}
+```
+
+> Minimal hello world app
+
+```kotlin
+/**
+ * 不要修改这个函数的任何内容
+ */
+fun main() {
+    @Suppress("unused_expression")
+    val eventListener = EventListener { event ->
+        val dyn = event.asDynamic()
+        event.asDynamic().respondWith(handleRequest(dyn.request as Request))
+        Unit
+    }
+    js("addEventListener('fetch', eventListener)")
+}
+
+/**
+ * 这里是处理http请求的函数
+ */
+@JsExport
+fun handleRequest(request: Request): Promise<Response> = GlobalScope.promise {
+    val server = WorkerApplication().apply {
+        route("/") {
+            respondText("Hello kotlin cloudflare worker")
+        }
+    }
+    return@promise server.handle(request)
+}
+
+```
+
+> 在本地运行之前需要先安装wrangler
+
+在项目根目录创建一个名为`wrangler.toml`的文件，然后将下面的内容复制进去并修改为你自己的信息
+
+```toml
+name = "kotlin-cloudflare-worker"  # 可以是任何名字
+account_id = "<your account id>"
+workers_dev = false
+preview_urls = false
+compatibility_date = "2022-08-11"
+main = "kotlin-cloudflare-worker.js"  # 必须和`outputModuleName`一致
+```
+
+运行gradle任务编译出js `gradlew compileProductionExecutableKotlinJs`,
+将wrangler.toml复制到 `build/compileSync/js/main/productionExecutable/kotlin`,
+并且进入该目录下运行`wrangler dev`
+
+## 部署
+
+使用`wrangler deploy`来部署到cloudflare worker, 在此之前你需要先使用`wrangler login`来登录
+
+# 注意事项
+
+Cloudflare worker 使用V8引擎来驱动js脚本，线程模型为单线程，所有时间均有event loop(事件循环)驱动，在此之外的所有任务
+都会被drop, 所以不要使用协程库中的launch或任何可以凭空创建出一个挂起作用域的函数来调用suspend函数, 取而代之的是你需要从
+`handleRequest`方法中传播`CoroutineScope`(suspend), 就像下面这样
+
+```kotlin
+// 不要使用这种方法
+val scope = CoroutineScope(Dispatcher.DEFAULT)
+
+fun blockingFunction() {
+    scope.launch {
+        // 这里的代码永远不会被执行
+    }
+}
+
+// 使用下面的代码来正确的调用suspend函数
+
+fun main() {
+    @Suppress("unused_expression")
+    val eventListener = EventListener { event ->
+        val dyn = event.asDynamic()
+        event.asDynamic().respondWith(handleRequest(dyn.request as Request))
+        Unit
+    }
+    js("addEventListener('fetch', eventListener)")
+}
+
+@JsExport
+fun handleRequest(request: Request): Promise<Response> = GlobalScope.promise {
+    return Promise.resolve(Response("Hello"))
+}
+```
+
+# Http 客户端
+
+不要使用ktor来作为http客户端, 因为cloudflare worker不是一个标准的nodejs环境， 你需要使用 fetch
+`cn.rtast.cfworker.client.fetch` 来发送http请求, 注意不是`window.fetch`， `window.fetch`是浏览器API
+
+# ByteArray 和 ByteBuffer 转换
+
+```kotlin
+import cn.rtast.cfworker.util.toByteArray
+import cn.rtast.cfworker.util.toArrayBuffer
+
+val bb: ByteBuffer = ...
+// 将ByteBuffer转换为ByteArray
+val ba: ByteArray = bb.toByteArray()
+
+// 将ByteArray转换为ByteBuffer
+val bb2: ByteBuffer = ba.toArrayBuffer()
+```
+
+# CPU时间限制
+
+cloudflare worker 免费版本限制处理每个请求的CPU时间为10ms(不包括IO等待时间), 如果你需要执行CPU密集型任务或需要更高的配额，
+请考虑升级到Workers paid或使用JS来减少标准库和协程库的加载时间.
+
+即使使用此库注册了超过15个api端点，并且都具备文件处理功能，每个请求占用的cpu时间平均值不超过10ms+-2ms,
+在冷启动时处理首次请求时间会大幅增加，最高可达50ms，但worker仍然可以处理并返回请求.
+
+![avg-cpu-time](./images/avg-cpu-time.png)
+
+> 上图反应了过去24小时每个请求的平均cpu时间(P50)
+
+# 已经使用此项目的实例
+
+https://repo.maven.rtast.cn
\ No newline at end of file
diff --git a/README.md b/README.md
index bd428a4..9a355dc 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,11 @@
 
 A library to running kotlin/js on cloudflare worker.
 
+<div style="display: block">
+<a href="README.md">English</a>
+<a href="README-zh.md">中文</a>
+</div>
+
 # Get started
 
 ## Setup
@@ -22,7 +27,7 @@ repositories {
 ```kotlin
 // to get latest version of this lib, go to 
 // https://next.pkg.rtast.cn/#/releases/cn/rtast/kotlin-cfworker/kotlin-cloudflare-worker/
-implementation("cn.rtast.kotlin-cfworker:kotlin-cloudflare-worker:1.0.1")
+implementation("cn.rtast.kotlin-cfworker:kotlin-cloudflare-worker:1.0.2")
 ```
 
 ## Run app
@@ -148,6 +153,20 @@ val ba: ByteArray = bb.toByteArray()
 val bb2: ByteBuffer = ba.toArrayBuffer()
 ```
 
+# CPU Time limit
+
+Cloudflare worker free tier have a limit of worker cpu limit (10ms, exclude IO waiting time), `kotlin cloudflare worker`
+depends on `kotlin-stdlib` and `kotlinx.coroutines`, which are quite heavy*, When performing CPU-bound task,
+please carefully consider whether to use JavaScript instead of Kotlin.
+
+But it works for my maven repository, I registered over 15 api endpoints.
+The avg cpu time for each endpoint does not exceed 10ms, but it may increase significantly during
+cold start (Over 50-200ms, but still responsible)
+
+![avg-cpu-time](./images/avg-cpu-time.png)
+
+> This image shows last 24 hours avg cpu time, see `P50`
+
 # Real instance
 
 https://repo.maven.rtast.cn
diff --git a/build.gradle.kts b/build.gradle.kts
index c6f434a..22daa89 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -4,7 +4,7 @@ plugins {
 }
 
 group = "cn.rtast.kotlin-cfworker"
-version = "1.0.1"
+version = "1.0.2"
 
 repositories {
     mavenCentral()
diff --git a/images/avg-cpu-time.png b/images/avg-cpu-time.png
new file mode 100644
index 0000000..936659e
Binary files /dev/null and b/images/avg-cpu-time.png differ
diff --git a/src/jsMain/kotlin/cn/rtast/cfworker/client/fetch.kt b/src/jsMain/kotlin/cn/rtast/cfworker/client/fetch.kt
index 031ee78..27ec8bf 100644
--- a/src/jsMain/kotlin/cn/rtast/cfworker/client/fetch.kt
+++ b/src/jsMain/kotlin/cn/rtast/cfworker/client/fetch.kt
@@ -7,11 +7,29 @@
 
 package cn.rtast.cfworker.client
 
+import cn.rtast.cfworker.util.toByteArray
+import kotlinx.coroutines.await
+import org.w3c.dom.url.URL
+import org.w3c.fetch.Request
 import org.w3c.fetch.RequestInit
 import org.w3c.fetch.Response
 import kotlin.js.Promise
 
+/**
+ * define fetch function externally
+ */
 public external fun fetch(
     input: String,
     init: RequestInit = definedExternally,
-): Promise<Response>
\ No newline at end of file
+): Promise<Response>
+
+/**
+ * Get request raw body, http POST
+ */
+public suspend fun Request.rawBody(): ByteArray =
+    this.arrayBuffer().await().toByteArray()
+
+/**
+ * Get [URL] object
+ */
+public val Request.Url: URL get() = URL(this.url)
\ No newline at end of file