diff --git a/zvm_doc/4_System_Build.rst b/zvm_doc/4_System_Build.rst
index 4d78c32137e0459c0f6a735671366822b2f3343b..8d73bde8cbb097a363ce2614e6f3f4e7d709f0e7 100644
--- a/zvm_doc/4_System_Build.rst
+++ b/zvm_doc/4_System_Build.rst
@@ -4,8 +4,14 @@
 
 QEMU platform
 ~~~~~~~~~~~~~~~~~~~~~
+1. 在zvm_workspace下运行以下命令(Export a Zephyr CMake package. This allows CMake to automatically load boilerplate code required for building Zephyr applications.)
 
-1. 在ZVM的工作目录下构建ZVM镜像
+.. code:: shell
+
+west zephyr-export
+
+
+2. 在ZVM的工作目录下构建ZVM镜像
 +++++++++++++++++++++++++++++++++++++++++++
 
 .. code:: shell
@@ -25,7 +31,7 @@ QEMU platform
    west build -b qemu_cortex_max_smp samples/_zvm 
 
 
-2. 生成ZVM镜像文件如下: 
+3. 生成ZVM镜像文件如下: 
 ++++++++++++++++++++++++++
 
 .. code:: shell