diff --git a/src/gausskernel/cbb/bbox/bbox_lib.cpp b/src/gausskernel/cbb/bbox/bbox_lib.cpp
index cdb2520e..c19ed3b9 100644
--- a/src/gausskernel/cbb/bbox/bbox_lib.cpp
+++ b/src/gausskernel/cbb/bbox/bbox_lib.cpp
@@ -347,9 +347,6 @@ void bbox_PutPid(struct PIPE_ID* pstPid)
     securec_check_c(rc, "\0", "\0");
 }
 
-/*
- * find available pipe id by file handle
- */
 /*
 function name: bbox_FindPid
 description: In all occupied pipes, the function search the flag pipe through compare all structure
@@ -379,8 +376,17 @@ struct PIPE_ID* bbox_FindPid(int iFd)
 }
 
 /*
- * run popen
- */
+function name: sys_popen
+description: The function gets a free pipe by function bbox_GetFreePid, if normally, then creat a pipe
+					through sys_pipe, andcreat a child process through function sys_fork, execute a  shell command
+                    to run a process.
+arguments: One pointer to a string that represents command line, another pointer of type const char* 
+				   indicates that the file file handle directs is used in the this mode.
+return value: A pointer of type struct PIPE_ID* or NULL.
+note: The string that indicates pszMode should only be "r" or "w",
+date: 2022/8/2
+contact tel: same
+*/
 s32 sys_popen(char* pszCmd, const char* pszMode)
 {
     struct PIPE_ID* volatile stCurPid = NULL;
@@ -485,8 +491,15 @@ s32 sys_popen(char* pszCmd, const char* pszMode)
 }
 
 /*
- * close file handle
- */
+function name: sys_pclose
+description: The function has an contrary action to function sys_popen, it close the pipe
+					that sys_popen open.
+arguments: iFd, an integer that indicates a file handle.
+return value: An integer that indicates the final status of the process working before. 
+note: none
+date: 2022/8/2
+contact tel: same
+*/
 int sys_pclose(s32 iFd)
 {
     struct PIPE_ID* pstCur = NULL;
@@ -511,6 +524,16 @@ int sys_pclose(s32 iFd)
 /*
  * list file in directory
  */
+/*
+function name: bbox_listdir
+description: The function has an contrary action to function sys_popen, it close the pipe
+					that sys_popen open.
+arguments: iFd, an integer that indicates a file handle.
+return value: An integer that indicates the final status of the process working before. 
+note: none
+date: 2022/8/2
+contact tel: same
+*/
 s32 bbox_listdir(const char* pstPath, BBOX_LIST_DIR_CALLBACK callback, void* pArgs)
 {
     struct linux_dirent* pstEntry = NULL;