diff --git a/README.en.md b/README.en.md
index 39ca58627738dc32cd6c7698cf86176d9b722131..69be0ab99a8c0721b0824c8ef716b7557dbae1ae 100644
--- a/README.en.md
+++ b/README.en.md
@@ -1,10 +1,12 @@
 # raspberrypi-kernel
 
+English | [简体中文](./README.md)
+
 #### Description
 
-The 4.19.90 kernel for running on Raspberry Pi, branch master is the branch on development.
+The kernel for running on Raspberry Pi.
 
-This repository is based on [4.19.90-2003.4.0](https://gitee.com/openeuler/kernel/tree/openEuler-1.0-LTS/) version kernel which is built into openEuler 20.03 LTS, and is merged with the 4.19.y branch of [Raspberry Pi kernel](https://github.com/raspberrypi/linux/tree/rpi-4.19.y).
+This repository is based on [openEuler kernel](https://gitee.com/openeuler/kernel) which is merged patches of [Raspberry Pi kernel](https://github.com/raspberrypi/linux).
 
 #### Architecture Requirements
 
@@ -18,31 +20,53 @@ Compile kernel and kernel modules.
 
 1.  Prepare compile environment
 
-OS: openEuler or CentOS 7/8;
+    OS: openEuler or CentOS 7/8;
 
-Architecture: AArch64.
+    Architecture: AArch64.
 
-You follow the documents of [raspberrypi](https://gitee.com/openeuler/raspberrypi/blob/master/README.en.md) to cross-compile this kernel. 
+    You follow the documents of [raspberrypi](https://gitee.com/openeuler/raspberrypi/blob/master/README.en.md) to cross-compile this kernel.
 
 2.  Download source
 
-`git clone git@gitee.com:openeuler/raspberrypi-kernel.git`
+    You need download different branches of different repositories according to the kernel version.
+
+    1.  Kernel 5.10
+
+        - openEuler 21.09: `git clone git@gitee.com:openeuler/raspberrypi-kernel.git -b openEuler-21.09 && cd raspberrypi-kernel`
+        - openEuler 21.03: `git clone git@gitee.com:openeuler/kernel.git -b openEuler-21.03 && cd kernel`
+
+    2.  Kernel 4.19
+
+        - openEuler 20.03 LTS: `git clone git@gitee.com:openeuler/raspberrypi-kernel.git -b openEuler-20.03-LTS && cd raspberrypi-kernel`
+        - openEuler 20.09: `git clone git@gitee.com:openeuler/raspberrypi-kernel.git -b openEuler-20.09 && cd raspberrypi-kernel`
 
 3.  Load default settings
 
-`make openeuler-raspi_defconfig`
+    You need load different settings according to the kernel version.
+
+    1.  Kernel 5.10
+
+        - openEuler 21.09: `make bcm2711_defconfig`
+        - openEuler 21.03: `make bcm2711_defconfig`
+
+    2.  Kernel 4.19
+
+        - openEuler 20.03 LTS: `make openeuler-raspi_defconfig`
+        - openEuler 20.09: `make openeuler-raspi_defconfig`
+
+    The corresponding defconfig file is in . /arch/arm64/configs.
 
 4.  Compile kernel
 
-`make ARCH=arm64 -j4`
+    `make ARCH=arm64 -j4`
 
 5.  Create directory for compiling kernel modules
 
-`mkdir ../output`
+    `mkdir ../output`
 
 6.  Compile kernel modules
 
-`make INSTALL_MOD_PATH=../output/ modules_install`
+    `make INSTALL_MOD_PATH=../output/ modules_install`
 
 Now, the kernel compilation is complete.
 
diff --git a/README.md b/README.md
index 9812291edc9b3558d3b8b20231ce4f06c2b2657b..2aefa412dbd4112ae18e76cf55c4c2e2f9899d8d 100644
--- a/README.md
+++ b/README.md
@@ -1,14 +1,16 @@
 # raspberrypi-kernel
 
+[English](./README.en.md) | 简体中文
+
 #### 介绍
 
-适用于树莓派 的 4.19.90 版本的内核源码，主开发分支为 master 分支。
+适用于树莓派的内核源码。
 
-本仓库基于 openEuler 20.3 LTS 的 [4.19.90-2003.4.0](https://gitee.com/openeuler/kernel/tree/4.19.90-2003.4.0/) 版本的内核，合并了上游 [树莓派内核 4.19.y](https://github.com/raspberrypi/linux/tree/rpi-4.19.y) 的分支代码。
+本仓库基于 [openEuler 内核](https://gitee.com/openeuler/kernel) ，合并了上游 [树莓派内核](https://github.com/raspberrypi/linux) 补丁。
 
 #### 支持硬件
 
-树莓派 3B/3B+/4B
+树莓派 3B/3B+/4B/400
 
 架构：AArch64
 
@@ -18,31 +20,53 @@
 
 1.  准备编译环境
 
-操作系统：openEuler 或 CentOS 7/8
+    操作系统：openEuler 或 CentOS 7/8
 
-架构：AArch64
+    架构：AArch64
 
-交叉编译请参照：[交叉编译内核](https://gitee.com/openeuler/raspberrypi/blob/master/documents/交叉编译内核.md)
+    交叉编译请参照：[交叉编译内核](https://gitee.com/openeuler/raspberrypi/blob/master/documents/交叉编译内核.md)
 
 2.  下载源码
 
-`git clone git@gitee.com:openeuler/raspberrypi-kernel.git`
+    根据内核不同版本，需要下载不同仓库的不同分支：
+
+    1.  5.10 内核
+
+        - openEuler 21.09：`git clone git@gitee.com:openeuler/raspberrypi-kernel.git -b openEuler-21.09 && cd raspberrypi-kernel`
+        - openEuler 21.03：`git clone git@gitee.com:openeuler/kernel.git -b openEuler-21.03 && cd kernel`
+
+    2.  4.19 内核
+
+        - openEuler 20.03 LTS：`git clone git@gitee.com:openeuler/raspberrypi-kernel.git -b openEuler-20.03-LTS && cd raspberrypi-kernel`
+        - openEuler 20.09：`git clone git@gitee.com:openeuler/raspberrypi-kernel.git -b openEuler-20.09 && cd raspberrypi-kernel`
 
 3.  载入默认设置
 
-`make openeuler-raspi_defconfig`
+    根据内核不同版本，需要载入不同的默认配置：
+
+    1.  5.10 内核
+
+        - openEuler 21.09：`make bcm2711_defconfig`
+        - openEuler 21.03：`make bcm2711_defconfig`
+
+    2.  4.19 内核
+
+        - openEuler 20.03 LTS：`make openeuler-raspi_defconfig`
+        - openEuler 20.09：`make openeuler-raspi_defconfig`
+
+    对应的 defconfig 文件在 ./arch/arm64/configs 下。
 
 4.  编译内核
 
-`make ARCH=arm64 -j4`
+    `make ARCH=arm64 -j4`
 
 5.  创建编译内核模块目录
 
-`mkdir ../output`
+    `mkdir ../output`
 
 6.  编译内核模块
 
-`make INSTALL_MOD_PATH=../output/ modules_install`
+    `make INSTALL_MOD_PATH=../output/ modules_install`
 
 至此，内核编译完成。