diff --git a/samples/samples_GPL/built-in/yolov9s/README.md b/samples/samples_GPL/built-in/yolov9s/README.md
index 50a27fb68d55c98c7e48770ede0d13047f2d9077..73b423ea03927a32157839285fb7590d77bc0f47 100644
--- a/samples/samples_GPL/built-in/yolov9s/README.md
+++ b/samples/samples_GPL/built-in/yolov9s/README.md
@@ -116,7 +116,27 @@ mkdir -p model
     mkdir -p build
     ```
 
-2. 切换到`build`目录，执行**cmake**生成编译文件。
+2. 设置环境变量
+    ```bash
+    export PATH=/path/to/clang/ohos/linux-x86_64/llvm/bin:$PATH
+    # eg: export PATH=/home/hispark/shared/sample/modelzoo-dev_ohos/oh/clang/ohos/linux-x86_64/llvm/bin:$PATH
+
+    export SYSROOT_PATH=/path/to/sysroot
+    # eg: export SYSROOT_PATH=/home/hispark/shared/sample/modelzoo-dev_ohos/oh/sysroot
+
+    # 下载SDK https://gitee.com/HiSpark/ss928v100_clang  
+    export NPU_INCLUDE_PATH=/path/to/smp/a55_linux/mpp/out/include
+    # eg：export NPU_INCLUDE_PATH=/home/hispark/shared/ss928v100inner/platform/ss928v100_clang/smp/a55_linux/mpp/out/include
+
+    export NPU_LIB_PATH=/path/to/smp/a55_linux/mpp/out/lib
+    # eg: export NPU_LIB_PATH=/home/hispark/shared/ss928v100inner/platform/ss928v100_clang/smp/a55_linux/mpp/out/lib
+
+    export NPU_HOST_LIB=/path/to/rootfs/usr/lib
+    # eg: NPU_HOST_LIB=/home/hispark/out/rootfs/usr/lib
+    # 找不到的话，可以复制开发板系统内的/usr/lib到编译环境上
+    ```
+
+3. 切换到`build`目录，执行**cmake**生成编译文件。
 
     当开发环境与运行环境操作系统架构不同时，执行以下命令进行交叉编译。
 
@@ -132,7 +152,7 @@ mkdir -p model
     cmake ../src -DCMAKE_BUILD_TYPE=Release -DCMAKE_TOOLCHAIN_FILE=../../../../common/cmake/toolchain_aarch64_ohos.cmake -DSOC_VERSION=SS928V100
     ```
 
-3. 执行**make**命令，生成的可执行文件main在"./out"目录下。
+3. 执行**make**命令，生成的可执行文件main在"../out"目录下。
 
 
 #### 运行应用