diff --git a/file_operate/create_ps/main.c b/file_operate/create_ps/main.c
new file mode 100644
index 0000000..70a32a0
--- /dev/null
+++ b/file_operate/create_ps/main.c
@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+int main() {
+  pid_t fpid;
+
+  fpid = fork();
+  // create child process
+  if (fpid < 0) {
+    printf("error in fork!");
+  } else if (fpid == 0) {
+    printf("I am the child process, my process id is %d\n", getpid());
+    sleep(10);
+  } else {
+    printf("I am the parent process, my process id is %d\n", getpid());
+    wait(NULL);
+    // exit(0);
+  }
+  return 0;
+}