diff --git a/components/libc/compilers/common/unistd.c b/components/libc/compilers/common/unistd.c
index df970b2b59..b7471ee029 100644
--- a/components/libc/compilers/common/unistd.c
+++ b/components/libc/compilers/common/unistd.c
@@ -5,10 +5,13 @@
  *
  * Change Logs:
  * Date           Author       Notes
- * 2020-09-01     Meco Man     First Version
+ * 2020-09-01     Meco Man     first Version
+ * 2021-02-12     Meco Man     move all functions located in <pthread_sleep.c> to this file
  */
 
 #include <unistd.h>
+#include <rtthread.h>
+#include <rthw.h>
 
 #ifdef RT_USING_POSIX_TERMIOS
 #include "termios.h"
@@ -24,3 +27,21 @@ char *ttyname(int fd)
 {
     return "/dev/tty0"; /*TODO: need to add more specific*/
 }
+
+unsigned int sleep(unsigned int seconds)
+{
+    rt_tick_t delta_tick;
+
+    delta_tick = rt_tick_get();
+    rt_thread_delay(seconds * RT_TICK_PER_SECOND);
+    delta_tick = rt_tick_get() - delta_tick;
+
+    return seconds - delta_tick/RT_TICK_PER_SECOND;
+}
+
+int usleep(useconds_t usec)
+{
+    rt_thread_mdelay(usec / 1000u);
+    rt_hw_us_delay(usec % 1000u);
+    return 0;
+}
diff --git a/components/libc/pthreads/posix_sleep.c b/components/libc/pthreads/posix_sleep.c
deleted file mode 100644
index e50bda7d4a..0000000000
--- a/components/libc/pthreads/posix_sleep.c
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- * Copyright (c) 2006-2018, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2020-12-16     Meco Man     add usleep
- */
-#include <rtthread.h>
-#include <rthw.h>
-#include <unistd.h>
-
-unsigned int sleep(unsigned int seconds)
-{
-    rt_tick_t delta_tick;
-
-    delta_tick = rt_tick_get();
-    rt_thread_delay(seconds * RT_TICK_PER_SECOND);
-    delta_tick = rt_tick_get() - delta_tick;
-
-    return seconds - delta_tick/RT_TICK_PER_SECOND;
-}
-
-int usleep(useconds_t usec)
-{
-    rt_thread_mdelay(usec / 1000u);
-    rt_hw_us_delay(usec % 1000u);
-    return 0;
-}