diff --git a/docs/howto-build-emu-riscv.md b/docs/howto-build-emu-riscv.md
index ae60403adf300d5df0c358ae7b7cdb7d35d8be12..e0ae5e2e6768f794497cda7568f4e1ca20aaf5e1 100644
--- a/docs/howto-build-emu-riscv.md
+++ b/docs/howto-build-emu-riscv.md
@@ -68,17 +68,17 @@ Bug reports: https://bugs.chromium.org/p/gerrit/issues/entry?template=Repo+tool+
 
 # 4. Download source code
 
-Create an emulator source code build directory, here assume it is `/home/u/emu-master-dev`, and then enter the directory.
+Create an emulator source code build directory, here assume it is `/home/u/emu-dev`, and then enter the directory.
 
 ```
-$ mkdir -p /home/u/emu-master-dev && cd /home/u/emu-master-dev
+$ mkdir -p /home/u/emu-dev && cd /home/u/emu-dev
 ```
 
 After entering the build directory, execute the following command to download 
 the source code.
 
 ```
-$ repo init -u git@github.com:aosp-riscv/platform_manifest -b riscv64-emu-master-dev
+$ repo init -u git@github.com:aosp-riscv/platform_manifest -b riscv64-emu-31.2.1.0-dev
 $ repo sync -j8
 ```
 
@@ -131,7 +131,7 @@ Recommended build products are 'sdk_phone_arm64-eng ' or 'sdk_phone_x86_64-eng'.
 To boot the generated system image:
 
 ```
-$ cd /home/u/emu-master-dev/external/qemu 
+$ cd /home/u/emu-dev/external/qemu
 $ ./android/rebuild.sh 
 $ export ANDROID_BUILD_TOP=/path/to/aosp
 $ objs/emulator
@@ -155,7 +155,7 @@ following commands:
 $ cd $AOSP/
 $ . build/envsetup.sh
 $ lunch sdk_phone_arm64-eng
-$ cd /home/u/emu-master-dev/external/qemu
+$ cd /home/u/emu-dev/external/qemu
 $ export ANDROID_BUILD_TOP=$AOSP
 $ objs/emulator -no-window -show-kernel -no-audio -qemu -machine virt
 ```
\ No newline at end of file
diff --git a/docs/zh/howto-build-emu-riscv.md b/docs/zh/howto-build-emu-riscv.md
index 4aa12eb01f019e0ad2b7958303d4c99226fe7016..b8b7ec67916b6c26204820c4d09d98422cabe157 100644
--- a/docs/zh/howto-build-emu-riscv.md
+++ b/docs/zh/howto-build-emu-riscv.md
@@ -69,16 +69,16 @@ Bug reports: https://bugs.chromium.org/p/gerrit/issues/entry?template=Repo+tool+
 
 # 4. 下载源码
 
-创建一个模拟器源码构建目录，这里假设是`/home/u/emu-master-dev`，然后进入该目录。
+创建一个模拟器源码构建目录，这里假设是`/home/u/emu-dev`，然后进入该目录。
 
 ```
-$ mkdir -p /home/u/emu-master-dev && cd /home/u/emu-master-dev
+$ mkdir -p /home/u/emu-dev && cd /home/u/emu-dev
 ```
 
 进入构建目录后，执行以下命令下载源代码。
 
 ```
-$ repo init -u git@github.com:aosp-riscv/platform_manifest -b riscv64-emu-master-dev
+$ repo init -u git@gitee.com:aosp-riscv/platform_manifest -b riscv64-emu-31.2.1.0-dev-cn
 $ repo sync -j8
 ```
 
@@ -128,7 +128,7 @@ $ make -j8
 利用我们自己构建的模拟器启动 AOSP 系统镜像的方法如下：
 
 ```
-$ cd /home/u/emu-master-dev/external/qemu 
+$ cd /home/u/emu-dev/external/qemu
 $ ./android/rebuild.sh 
 $ export ANDROID_BUILD_TOP=/path/to/aosp
 $ objs/emulator
@@ -149,7 +149,7 @@ $ objs/emulator
 $ cd $AOSP/
 $ . build/envsetup.sh
 $ lunch sdk_phone_arm64-eng
-$ cd /home/u/emu-master-dev/external/qemu
+$ cd /home/u/emu-dev/external/qemu
 $ export ANDROID_BUILD_TOP=$AOSP
 $ objs/emulator -no-window -show-kernel -no-audio -qemu -machine virt
 ```
\ No newline at end of file