diff --git a/primary/pr/docs/How-to-submit-a-PR/How-to-submit-a-PR.md b/primary/pr/docs/How-to-submit-a-PR/How-to-submit-a-PR.md
index 16aea0712a65c88a33986aa4aed2aba4d7b8b53c..cabc11089cbe03cbe16771facc02ea033c2cf00b 100644
--- a/primary/pr/docs/How-to-submit-a-PR/How-to-submit-a-PR.md
+++ b/primary/pr/docs/How-to-submit-a-PR/How-to-submit-a-PR.md
@@ -213,15 +213,14 @@ https://gitee.com/openeuler/community/blob/master/en/sig-infrastructure/command.
 
 
 
-## V 运行本仓库中的程序
+## V 运行hello程序
 
 
-可以运行仓库中的main.c程序以观看提交后的效果。该main程序可以在Linux和类UNIX的macOS上运行。在Windows上，您可以看一下[openEuler开源创新实践课](https://gitee.com/openeuler/lfs-course/tree/master/lfs-7.7-systemd)中是如何创建虚拟机并安装openEuler操作系统以运行程序的。编译和运行该程序的命令如下所示：
+可以编译、运行src目录下的hello.c程序以观看提交后的效果，该程序可以在Linux和类UNIX的macOS上运行，下面是一个示例：
 
 ```shell
-cd primary/pr/src/
-gcc main.c
-./a.out
+gcc hello.c -o hello
+./hello ../../../playground/pr/
 ```
 
 这样，凡是正确提交并被合入PR了的Gitee-ID都可以在电脑屏幕上被打印出来…… :)
diff --git a/primary/pr/src/main.c b/primary/pr/src/hello.c
similarity index 63%
rename from primary/pr/src/main.c
rename to primary/pr/src/hello.c
index 8869f0dfb5aadff98ae41beceb4b7eec71565d2c..909133efdd4ffe7dd3449fdc1c8cbcd8f84592de 100644
--- a/primary/pr/src/main.c
+++ b/primary/pr/src/hello.c
@@ -1,11 +1,13 @@
 /*
- * main.c
+ * hello.c
  *
  * This program runs on Linux and UNIX-like macOS.
  *
  * Compile and run the program:
- * gcc this-file
- * ./a.out
+ *   gcc hello.c -o hello
+ *   ./hello PATH-TO-PR-PLAYGROUND
+ *   其名称设置成Gitee-ID的文件默认置于playground的pr目录。相对于当前目录，则为：
+ *   ./hello ../../../playground/pr/
  */ 
 
 #include <stdio.h>
@@ -13,12 +15,16 @@
 #include <unistd.h>
 #include <string.h>
 
-int main() {
-    // 其名称设置成Gitee-ID的文件将置于本程序的上级目录
-    DIR *dir = opendir("../../../playground/pr/");
+int main(int argc, char *argv[]) {
+    if (argc < 2) {
+        printf("\nUsage:\n%s PATH-TO-PR-PLAYGROUND\n\n", argv[0]);
+        return 0;
+    }
+
+    DIR *dir = opendir(argv[1]);
     if (dir == NULL) {
-        perror("Unable to open parent directory");
-        return 1;
+        perror("Unable to open PR playground directory");
+        return -1;
     }
 
     struct dirent *entry;
@@ -40,3 +46,4 @@ int main() {
     printf(":)\n");
     return 0;
 }
+