diff --git a/components/signal/los_signal.c b/components/signal/los_signal.c
index b9d80a87..069fbc6c 100644
--- a/components/signal/los_signal.c
+++ b/components/signal/los_signal.c
@@ -144,6 +144,7 @@ STATIC VOID SignalHandle(LosTaskCB *task, BOOL cleanStatus)
 
 STATIC VOID SignalEntry(INT32 sigNo)
 {
+    (void)sigNo;
     LosTaskCB *task = OsCurrTaskGet();
     OsSigCB *sigCB = (OsSigCB *)task->sig;
 
diff --git a/kal/cmsis/cmsis_liteos2.c b/kal/cmsis/cmsis_liteos2.c
index c99bf731..997e336c 100644
--- a/kal/cmsis/cmsis_liteos2.c
+++ b/kal/cmsis/cmsis_liteos2.c
@@ -841,6 +841,7 @@ osEventFlagsId_t osEventFlagsNew(const osEventFlagsAttr_t *attr)
 
 const char *osEventFlagsGetName(osEventFlagsId_t ef_id)
 {
+    (void)ef_id;
     if (OS_INT_ACTIVE) {
         return NULL;
     }
diff --git a/kal/posix/src/semaphore.c b/kal/posix/src/semaphore.c
index c74a4044..0400b0f5 100644
--- a/kal/posix/src/semaphore.c
+++ b/kal/posix/src/semaphore.c
@@ -82,8 +82,8 @@ int sem_init(sem_t *sem, int shared, unsigned int value)
         return -1;
     }
 
-    sem->s_magic = (int)_SEM_MAGIC;
-    sem->s_handle = (int)semHandle;
+    sem->s_magic = (INT32)_SEM_MAGIC;
+    sem->s_handle = (INT32)semHandle;
 
     return 0;
 }
@@ -92,7 +92,7 @@ int sem_destroy(sem_t *sem)
 {
     UINT32 ret;
 
-    if ((sem == NULL) || (sem->s_magic != (int)_SEM_MAGIC)) {
+    if ((sem == NULL) || (sem->s_magic != (INT32)_SEM_MAGIC)) {
         errno = EINVAL;
         return -1;
     }
@@ -110,7 +110,7 @@ int sem_wait(sem_t *sem)
 {
     UINT32 ret;
 
-    if ((sem == NULL) || (sem->s_magic != (int)_SEM_MAGIC)) {
+    if ((sem == NULL) || (sem->s_magic != (INT32)_SEM_MAGIC)) {
         errno = EINVAL;
         return -1;
     }
@@ -128,7 +128,7 @@ int sem_post(sem_t *sem)
 {
     UINT32 ret;
 
-    if ((sem == NULL) || (sem->s_magic != (int)_SEM_MAGIC)) {
+    if ((sem == NULL) || (sem->s_magic != (INT32)_SEM_MAGIC)) {
         errno = EINVAL;
         return -1;
     }
@@ -146,7 +146,7 @@ int sem_trywait(sem_t *sem)
 {
     UINT32 ret;
 
-    if ((sem == NULL) || (sem->s_magic != _SEM_MAGIC)) {
+    if ((sem == NULL) || (sem->s_magic != (INT32)_SEM_MAGIC)) {
         errno = EINVAL;
         return -1;
     }
@@ -165,7 +165,7 @@ int sem_timedwait(sem_t *sem, const struct timespec *timeout)
     UINT32 ret;
     UINT64 tickCnt;
 
-    if ((sem == NULL) || (sem->s_magic != (int)_SEM_MAGIC)) {
+    if ((sem == NULL) || (sem->s_magic != (INT32)_SEM_MAGIC)) {
         errno = EINVAL;
         return -1;
     }
@@ -193,7 +193,7 @@ int sem_getvalue(sem_t *sem, int *currVal)
 {
     UINT32 ret;
 
-    if ((sem == NULL) || (sem->s_magic != _SEM_MAGIC)|| (currVal == NULL)) {
+    if ((sem == NULL) || (sem->s_magic != (INT32)_SEM_MAGIC)|| (currVal == NULL)) {
         errno = EINVAL;
         return -1;
     }
diff --git a/kernel/src/los_sched.c b/kernel/src/los_sched.c
index 55580ab8..ed6a6f12 100644
--- a/kernel/src/los_sched.c
+++ b/kernel/src/los_sched.c
@@ -131,7 +131,7 @@ VOID OsSchedUpdateExpireTime(VOID)
     isPmMode = OsIsPmMode();
 #endif
     if ((runTask->taskID != g_idleTaskID) && !isPmMode) {
-        INT32 timeSlice = (runTask->timeSlice <= OS_TIME_SLICE_MIN) ? OS_SCHED_TIME_SLICES : runTask->timeSlice;
+        INT32 timeSlice = (runTask->timeSlice <= OS_TIME_SLICE_MIN) ? (INT32)OS_SCHED_TIME_SLICES : runTask->timeSlice;
         endTime = runTask->startTime + timeSlice;
     } else {
         endTime = OS_SCHED_MAX_RESPONSE_TIME - OS_TICK_RESPONSE_PRECISION;