diff --git a/porting/liteos_a/user/src/process/waitid.c b/porting/liteos_a/user/src/process/waitid.c
deleted file mode 100644
index 6622e06dcd69dd7a110b6900f694769c2dfdf844..0000000000000000000000000000000000000000
--- a/porting/liteos_a/user/src/process/waitid.c
+++ /dev/null
@@ -1,9 +0,0 @@
-#include <sys/wait.h>
-#include <unsupported_api.h>
-#include "syscall.h"
-
-int waitid(idtype_t type, id_t id, siginfo_t *info, int options)
-{
-	unsupported_api(__FUNCTION__);
-	return syscall_cp(SYS_waitid, type, id, info, options, 0);
-}
diff --git a/porting/liteos_a/user/src/signal/killpg.c b/porting/liteos_a/user/src/signal/killpg.c
deleted file mode 100644
index 238b69bdc74ddec982e86f41955ef1f355356a22..0000000000000000000000000000000000000000
--- a/porting/liteos_a/user/src/signal/killpg.c
+++ /dev/null
@@ -1,13 +0,0 @@
-#include <signal.h>
-#include <errno.h>
-#include <unsupported_api.h>
-
-int killpg(pid_t pgid, int sig)
-{
-	unsupported_api(__FUNCTION__);
-	if (pgid < 0) {
-		errno = EINVAL;
-		return -1;
-	}
-	return kill(-pgid, sig);
-}