diff --git a/kernel/base/core/los_task.c b/kernel/base/core/los_task.c
index b1d5d9231a12a06a569d2d75a14af9c568eb5d85..14ee0598a7e009744ee897ad3cd5a4605f043e30 100644
--- a/kernel/base/core/los_task.c
+++ b/kernel/base/core/los_task.c
@@ -1249,19 +1249,19 @@ EXIT:
     return err;
 }
 
-UINT32 OsUserTaskOperatePermissionsCheck(LosTaskCB *taskCB)
+INT32 OsUserTaskOperatePermissionsCheck(const LosTaskCB *taskCB)
 {
     return OsUserProcessOperatePermissionsCheck(taskCB, OsCurrProcessGet()->processID);
 }
 
-UINT32 OsUserProcessOperatePermissionsCheck(LosTaskCB *taskCB, UINT32 processID)
+INT32 OsUserProcessOperatePermissionsCheck(const LosTaskCB *taskCB, UINT32 processID)
 {
     if (taskCB == NULL) {
         return LOS_EINVAL;
     }
 
     if (processID == OS_INVALID_VALUE) {
-        return OS_INVALID_VALUE;
+        return LOS_EINVAL;
     }
 
     if (taskCB->taskStatus & OS_TASK_STATUS_UNUSED) {
diff --git a/kernel/base/include/los_task_pri.h b/kernel/base/include/los_task_pri.h
index d2b27dc6ae5812aba94567b97e03db6dbbd00176..f5e399e4514dfbcb296c6ae2f3dc962d80583a15 100644
--- a/kernel/base/include/los_task_pri.h
+++ b/kernel/base/include/los_task_pri.h
@@ -323,8 +323,8 @@ extern UINT32 OsCreateUserTask(UINT32 processID, TSK_INIT_PARAM_S *initParam);
 extern INT32 OsSetTaskName(LosTaskCB *taskCB, const CHAR *name, BOOL setPName);
 extern VOID OsTaskCBRecycleToFree(VOID);
 extern VOID OsRunningTaskToExit(LosTaskCB *runTask, UINT32 status);
-extern UINT32 OsUserTaskOperatePermissionsCheck(LosTaskCB *taskCB);
-extern UINT32 OsUserProcessOperatePermissionsCheck(LosTaskCB *taskCB, UINT32 processID);
+extern INT32 OsUserTaskOperatePermissionsCheck(const LosTaskCB *taskCB);
+extern INT32 OsUserProcessOperatePermissionsCheck(const LosTaskCB *taskCB, UINT32 processID);
 extern INT32 OsTcbDispatch(LosTaskCB *stcb, siginfo_t *info);
 extern VOID OsWriteResourceEvent(UINT32 events);
 extern VOID OsWriteResourceEventUnsafe(UINT32 events);
diff --git a/kernel/base/ipc/los_futex.c b/kernel/base/ipc/los_futex.c
index 437381ec559e25fb3da26b99f50d80b606c3acf8..44de7a5b4792ead1da572d152483e50c63b06e01 100644
--- a/kernel/base/ipc/los_futex.c
+++ b/kernel/base/ipc/los_futex.c
@@ -112,16 +112,16 @@ STATIC VOID OsFutexShowTaskNodeAttr(const LOS_DL_LIST *futexList)
     LOS_DL_LIST *queueList = NULL;
 
     tempNode = OS_FUTEX_FROM_FUTEXLIST(futexList);
-    PRINTK("key(pid)           : 0x%x(%d) : ->", tempNode->key, tempNode->pid);
+    PRINTK("key(pid)           : 0x%x(%u) : ->", tempNode->key, tempNode->pid);
 
     for (queueList = &tempNode->queueList; ;) {
         lastNode = OS_FUTEX_FROM_QUEUELIST(queueList);
         if (!LOS_ListEmpty(&(lastNode->pendList))) {
             taskCB = OS_TCB_FROM_PENDLIST(LOS_DL_LIST_FIRST(&(lastNode->pendList)));
-            PRINTK(" %d(%d) ->", taskCB->taskID, taskCB->priority);
+            PRINTK(" %u(%u) ->", taskCB->taskID, taskCB->priority);
         } else {
             taskCB = LOS_DL_LIST_ENTRY(lastNode, LosTaskCB, futex);
-            PRINTK(" %d(%d) ->", taskCB->taskID, -1);
+            PRINTK(" %u(%d) ->", taskCB->taskID, -1);
         }
         queueList = queueList->pstNext;
         if (queueList == &tempNode->queueList) {
diff --git a/kernel/base/mp/los_stat.c b/kernel/base/mp/los_stat.c
index a0d25ca0af9e3f5dc98d069fabcb11dce6f930ea..2810c2ec491f21f98fe7fc45dd3f7850a521ca8f 100644
--- a/kernel/base/mp/los_stat.c
+++ b/kernel/base/mp/los_stat.c
@@ -173,7 +173,7 @@ LITE_OS_SEC_TEXT_MINOR VOID OsShellCmdDumpSched(VOID)
 
         affinity = (UINT32)taskCB->cpuAffiMask;
 
-        PRINTK("%-30s0x%-6x%+16lf ms  %10d\n", taskCB->taskName, taskCB->taskID,
+        PRINTK("%-30s0x%-6x%+16lf ms  %10u\n", taskCB->taskName, taskCB->taskID,
                (DOUBLE)(taskCB->schedStat.allRuntime) / NS_PER_MS,
                taskCB->schedStat.allContextSwitch);
 
@@ -183,7 +183,7 @@ LITE_OS_SEC_TEXT_MINOR VOID OsShellCmdDumpSched(VOID)
             }
 
             PRINTK("                                                                           "
-                   "CPU%d    %+16lf ms  %12d\n", cpuid,
+                   "CPU%u    %+16lf ms  %12u\n", cpuid,
                    (DOUBLE)(taskCB->schedStat.schedPercpu[cpuid].runtime) / NS_PER_MS,
                    taskCB->schedStat.schedPercpu[cpuid].contexSwitch);
         }
@@ -251,7 +251,7 @@ LITE_OS_SEC_TEXT_MINOR VOID OsMpStaticShow(UINT64 mpStaticPastTime)
            "----------    ----------    ----------    ----------\n");
 
     for (cpuid = 0; cpuid < LOSCFG_KERNEL_CORE_NUM; cpuid++) {
-        PRINTK("CPU%d   %+10lf%14d%14d%14d   %+11lf   %+11lf   %+11lf%14d   %+11lf\n", cpuid,
+        PRINTK("CPU%u   %+10lf%14u%14u%14u   %+11lf   %+11lf   %+11lf%14u   %+11lf\n", cpuid,
                ((DOUBLE)(g_mpStatPercpu[cpuid].idleRuntime) / mpStaticPastTime) * DECIMAL_TO_PERCENTAGE,
                g_mpStatPercpu[cpuid].contexSwitch,
                g_mpStatPercpu[cpuid].hwiNum,
diff --git a/syscall/process_syscall.c b/syscall/process_syscall.c
index 916ccbcf9b12a1dab68622bb04bc34f1f288500e..59165d2b7e61931b79a3ab3449234f540250149c 100644
--- a/syscall/process_syscall.c
+++ b/syscall/process_syscall.c
@@ -43,7 +43,6 @@
 #include "capability_api.h"
 #endif
 
-
 static int OsPermissionToCheck(unsigned int pid, unsigned int who)
 {
     int ret = LOS_GetProcessGroupID(pid);
@@ -78,8 +77,8 @@ static int OsUserTaskSchedulerSet(unsigned int tid, unsigned short policy, unsig
         return EINVAL;
     }
 
-    SCHEDULER_LOCK(intSave);
     LosTaskCB *taskCB = OS_TCB_FROM_TID(tid);
+    SCHEDULER_LOCK(intSave);
     ret = OsUserTaskOperatePermissionsCheck(taskCB);
     if (ret != LOS_OK) {
         SCHEDULER_UNLOCK(intSave);
@@ -100,13 +99,14 @@ static int OsUserTaskSchedulerSet(unsigned int tid, unsigned short policy, unsig
 
 void SysSchedYield(int type)
 {
+    (void)type;
+
     (void)LOS_TaskYield();
     return;
 }
 
 int SysSchedGetScheduler(int id, int flag)
 {
-    LosTaskCB *taskCB = NULL;
     unsigned int intSave;
     int policy;
     int ret;
@@ -116,15 +116,15 @@ int SysSchedGetScheduler(int id, int flag)
             return -EINVAL;
         }
 
+        LosTaskCB *taskCB = OS_TCB_FROM_TID(id);
         SCHEDULER_LOCK(intSave);
-        taskCB = OS_TCB_FROM_TID(id);
         ret = OsUserTaskOperatePermissionsCheck(taskCB);
         if (ret != LOS_OK) {
             SCHEDULER_UNLOCK(intSave);
             return -ret;
         }
 
-        policy = taskCB->policy;
+        policy = (int)taskCB->policy;
         SCHEDULER_UNLOCK(intSave);
         return policy;
     }
@@ -158,8 +158,7 @@ int SysSchedSetScheduler(int id, int policy, int prio, int flag)
 
 int SysSchedGetParam(int id, int flag)
 {
-    LosTaskCB *taskCB = NULL;
-    int pri;
+    int prio;
     unsigned int intSave;
 
     if (flag < 0) {
@@ -167,17 +166,17 @@ int SysSchedGetParam(int id, int flag)
             return -EINVAL;
         }
 
+        LosTaskCB *taskCB = OS_TCB_FROM_TID(id);
         SCHEDULER_LOCK(intSave);
-        taskCB = OS_TCB_FROM_TID(id);
-        pri = OsUserTaskOperatePermissionsCheck(taskCB);
-        if (pri != LOS_OK) {
+        prio = OsUserTaskOperatePermissionsCheck(taskCB);
+        if (prio != LOS_OK) {
             SCHEDULER_UNLOCK(intSave);
-            return -pri;
+            return -prio;
         }
 
-        pri = taskCB->priority;
+        prio = (int)taskCB->priority;
         SCHEDULER_UNLOCK(intSave);
-        return pri;
+        return prio;
     }
 
     if (id == 0) {
@@ -894,17 +893,15 @@ unsigned int SysCreateUserThread(const TSK_ENTRY_FUNC func, const UserTaskParam
 int SysSetThreadArea(const char *area)
 {
     unsigned int intSave;
-    LosTaskCB *taskCB = NULL;
-    LosProcessCB *processCB = NULL;
-    unsigned int ret = LOS_OK;
+    int ret = LOS_OK;
 
     if (!LOS_IsUserAddress((unsigned long)(uintptr_t)area)) {
         return EINVAL;
     }
 
+    LosTaskCB *taskCB = OsCurrTaskGet();
     SCHEDULER_LOCK(intSave);
-    taskCB = OsCurrTaskGet();
-    processCB = OS_PCB_FROM_PID(taskCB->processID);
+    LosProcessCB *processCB = OS_PCB_FROM_PID(taskCB->processID);
     if (processCB->processMode != OS_USER_MODE) {
         ret = EPERM;
         goto OUT;
@@ -925,20 +922,19 @@ int SysUserThreadSetDetach(unsigned int taskID)
 {
     unsigned int intSave;
     int ret;
-    LosTaskCB *taskCB = NULL;
 
     if (OS_TID_CHECK_INVALID(taskID)) {
         return EINVAL;
     }
 
+    LosTaskCB *taskCB = OS_TCB_FROM_TID(taskID);
     SCHEDULER_LOCK(intSave);
-    taskCB = OS_TCB_FROM_TID(taskID);
     ret = OsUserTaskOperatePermissionsCheck(taskCB);
     if (ret != LOS_OK) {
         goto EXIT;
     }
 
-    ret = OsTaskSetDetachUnsafe(taskCB);
+    ret = (int)OsTaskSetDetachUnsafe(taskCB);
 
 EXIT:
     SCHEDULER_UNLOCK(intSave);
@@ -948,7 +944,7 @@ EXIT:
 int SysUserThreadDetach(unsigned int taskID)
 {
     unsigned int intSave;
-    unsigned int ret;
+    int ret;
 
     if (OS_TID_CHECK_INVALID(taskID)) {
         return EINVAL;
@@ -961,8 +957,7 @@ int SysUserThreadDetach(unsigned int taskID)
         return ret;
     }
 
-    ret = LOS_TaskDelete(taskID);
-    if (ret != LOS_OK) {
+    if (LOS_TaskDelete(taskID) != LOS_OK) {
         return ESRCH;
     }
 
@@ -972,21 +967,20 @@ int SysUserThreadDetach(unsigned int taskID)
 int SysThreadJoin(unsigned int taskID)
 {
     unsigned int intSave;
-    unsigned int ret;
-    LosTaskCB *taskCB = NULL;
+    int ret;
 
     if (OS_TID_CHECK_INVALID(taskID)) {
         return EINVAL;
     }
 
+    LosTaskCB *taskCB = OS_TCB_FROM_TID(taskID);
     SCHEDULER_LOCK(intSave);
-    taskCB = OS_TCB_FROM_TID(taskID);
     ret = OsUserTaskOperatePermissionsCheck(taskCB);
     if (ret != LOS_OK) {
         goto EXIT;
     }
 
-    ret = OsTaskJoinPendUnsafe(OS_TCB_FROM_TID(taskID));
+    ret = (int)OsTaskJoinPendUnsafe(OS_TCB_FROM_TID(taskID));
 
 EXIT:
     SCHEDULER_UNLOCK(intSave);