diff --git a/compat/posix/src/time.c b/compat/posix/src/time.c
index 865f8dbd..10732be4 100644
--- a/compat/posix/src/time.c
+++ b/compat/posix/src/time.c
@@ -950,11 +950,11 @@ int timer_getoverrun(timer_t timerID)
     return (overRun > DELAYTIMER_MAX) ? DELAYTIMER_MAX : overRun;
 }
 
-STATIC INT32 DoNanoSleep(UINT64 useconds)
+STATIC INT32 DoNanoSleep(UINT64 nanoseconds)
 {
     UINT32 ret;
 
-    ret = LOS_TaskDelay(OsUS2Tick(useconds));
+    ret = LOS_TaskDelay(OsNS2Tick(nanoseconds));
     if (ret == LOS_OK || ret == LOS_ERRNO_TSK_YIELD_NOT_ENOUGH_TASK) {
         return 0;
     }
@@ -963,12 +963,12 @@ STATIC INT32 DoNanoSleep(UINT64 useconds)
 
 int usleep(unsigned useconds)
 {
-    return DoNanoSleep((UINT64)useconds);
+    return DoNanoSleep((UINT64)useconds * OS_SYS_NS_PER_US);
 }
 
 int nanosleep(const struct timespec *rqtp, struct timespec *rmtp)
 {
-    UINT64 useconds;
+    UINT64 nanoseconds;
     INT32 ret = -1;
 
     (VOID)rmtp;
@@ -979,14 +979,14 @@ int nanosleep(const struct timespec *rqtp, struct timespec *rmtp)
         return ret;
     }
 
-    useconds = (UINT64)rqtp->tv_sec * OS_SYS_US_PER_SECOND + rqtp->tv_nsec / OS_SYS_NS_PER_US;
+    nanoseconds = (UINT64)rqtp->tv_sec * OS_SYS_NS_PER_SECOND + rqtp->tv_nsec;
 
-    return DoNanoSleep(useconds);
+    return DoNanoSleep(nanoseconds);
 }
 
 unsigned int sleep(unsigned int seconds)
 {
-    return DoNanoSleep((UINT64)seconds * OS_SYS_US_PER_SECOND);
+    return DoNanoSleep((UINT64)seconds * OS_SYS_NS_PER_SECOND);
 }
 
 double difftime(time_t time2, time_t time1)
diff --git a/kernel/base/core/los_sys.c b/kernel/base/core/los_sys.c
index 5f77c108..8a9d373a 100644
--- a/kernel/base/core/los_sys.c
+++ b/kernel/base/core/los_sys.c
@@ -59,11 +59,11 @@ LITE_OS_SEC_TEXT_MINOR UINT32 LOS_Tick2MS(UINT32 tick)
     return ((UINT64)tick * OS_SYS_MS_PER_SECOND) / LOSCFG_BASE_CORE_TICK_PER_SECOND;
 }
 
-LITE_OS_SEC_TEXT_MINOR UINT32 OsUS2Tick(UINT64 microsec)
+LITE_OS_SEC_TEXT_MINOR UINT32 OsNS2Tick(UINT64 nanoseconds)
 {
-    const UINT32 usPerTick = OS_SYS_US_PER_SECOND / LOSCFG_BASE_CORE_TICK_PER_SECOND;
+    const UINT32 nsPerTick = OS_SYS_NS_PER_SECOND / LOSCFG_BASE_CORE_TICK_PER_SECOND;
 
-    UINT64 ticks = (microsec + usPerTick - 1) / usPerTick;
+    UINT64 ticks = (nanoseconds + nsPerTick - 1) / nsPerTick;
     if (ticks > OS_MAX_VALUE) {
         ticks = OS_MAX_VALUE;
     }
diff --git a/kernel/base/include/los_sys_pri.h b/kernel/base/include/los_sys_pri.h
index f980a1d1..e937e3aa 100644
--- a/kernel/base/include/los_sys_pri.h
+++ b/kernel/base/include/los_sys_pri.h
@@ -121,9 +121,9 @@ extern "C" {
 
 /**
  * @ingroup los_sys
- * Convert microseconds to Ticks.
+ * Convert nanoseconds to Ticks.
  */
-extern UINT32 OsUS2Tick(UINT64 microsec);
+extern UINT32 OsNS2Tick(UINT64 nanoseconds);
 
 #ifdef __cplusplus
 #if __cplusplus
diff --git a/kernel/base/ipc/los_futex.c b/kernel/base/ipc/los_futex.c
index d831a7c5..1c6afd2c 100644
--- a/kernel/base/ipc/los_futex.c
+++ b/kernel/base/ipc/los_futex.c
@@ -647,7 +647,7 @@ INT32 OsFutexWait(const UINT32 *userVaddr, UINT32 flags, UINT32 val, UINT32 absT
         return ret;
     }
     if (absTime != LOS_WAIT_FOREVER) {
-        timeOut = OsUS2Tick(absTime);
+        timeOut = OsNS2Tick((UINT64)absTime * OS_SYS_NS_PER_US);
     }
 
     return OsFutexWaitTask(userVaddr, flags, val, timeOut);
diff --git a/testsuites/unittest/time/clock/full/clock_test_010.cpp b/testsuites/unittest/time/clock/full/clock_test_010.cpp
index 197da67c..2b14879b 100644
--- a/testsuites/unittest/time/clock/full/clock_test_010.cpp
+++ b/testsuites/unittest/time/clock/full/clock_test_010.cpp
@@ -64,12 +64,12 @@ static int SleepTest(int64_t expectTime)
     LogPrintln("slept time (expected --> actual): %" PRId64 "ns --> %" PRId64 "ns, delta: %" PRId64 "ns\n", expectTime,
         escapeTime, escapeTime - expectTime);
 
-    g_failCnt += (escapeTime < expectTime || (escapeTime - expectTime) >= 20000000); // 20000000, 2 ticks.
+    g_failCnt += (escapeTime < expectTime);
 
     return 0;
 }
 
-static int ClockTest(void)
+static void *ClockTestThread(void *arg)
 {
     (void)SleepTest(0);
     (void)SleepTest(2); // 2, ns.
@@ -84,6 +84,27 @@ static int ClockTest(void)
     (void)SleepTest(10e6 + 1); // 10ms+1ns
     (void)SleepTest(25e6);     // 25ms
     (void)SleepTest(1e9);      // 1s
+
+    return NULL;
+}
+
+static int ClockTest(void)
+{
+    int ret;
+    pthread_t thread;
+    struct sched_param param = { 0 };
+    pthread_attr_t attr;
+    pthread_attr_init(&attr);
+
+    pthread_attr_setschedpolicy(&attr, SCHED_FIFO);
+    pthread_attr_setschedparam(&attr, &param);
+
+    ret = pthread_create(&thread, &attr, ClockTestThread, NULL);
+    ICUNIT_ASSERT_EQUAL(ret, 0, ret);
+
+    ret = pthread_join(thread, NULL);
+    ICUNIT_ASSERT_EQUAL(ret, 0, ret);
+
     ICUNIT_ASSERT_EQUAL(g_failCnt, 0, g_failCnt);
     return 0;
 }