diff --git a/arch/arm/arm/src/los_arch_mmu.c b/arch/arm/arm/src/los_arch_mmu.c
index cce73fe259d550dfa4bb7411848ca3815f76308b..b3991ce27b58699cd2a481d86e2119d29369a037 100644
--- a/arch/arm/arm/src/los_arch_mmu.c
+++ b/arch/arm/arm/src/los_arch_mmu.c
@@ -871,7 +871,7 @@ STATIC VOID OsSetKSectionAttr(UINTPTR virtAddr, BOOL uncached)
     kSpace->archMmu.virtTtb = (PTE_T *)g_firstPageTable;
     kSpace->archMmu.physTtb = LOS_PaddrQuery(kSpace->archMmu.virtTtb);
     status = LOS_ArchMmuUnmap(&kSpace->archMmu, virtAddr,
-                               (bssEndBoundary - virtAddr) >> MMU_DESCRIPTOR_L2_SMALL_SHIFT);
+                              (bssEndBoundary - virtAddr) >> MMU_DESCRIPTOR_L2_SMALL_SHIFT);
     if (status != ((bssEndBoundary - virtAddr) >> MMU_DESCRIPTOR_L2_SMALL_SHIFT)) {
         VM_ERR("unmap failed, status: %d", status);
         return;
@@ -882,8 +882,8 @@ STATIC VOID OsSetKSectionAttr(UINTPTR virtAddr, BOOL uncached)
         flags |= VM_MAP_REGION_FLAG_UNCACHED;
     }
     status = LOS_ArchMmuMap(&kSpace->archMmu, virtAddr, SYS_MEM_BASE,
-                             (textStart - virtAddr) >> MMU_DESCRIPTOR_L2_SMALL_SHIFT,
-                             flags);
+                            (textStart - virtAddr) >> MMU_DESCRIPTOR_L2_SMALL_SHIFT,
+                            flags);
     if (status != ((textStart - virtAddr) >> MMU_DESCRIPTOR_L2_SMALL_SHIFT)) {
         VM_ERR("mmap failed, status: %d", status);
         return;
@@ -910,9 +910,9 @@ STATIC VOID OsSetKSectionAttr(UINTPTR virtAddr, BOOL uncached)
         flags |= VM_MAP_REGION_FLAG_UNCACHED;
     }
     status = LOS_ArchMmuMap(&kSpace->archMmu, bssEndBoundary,
-                             SYS_MEM_BASE + bssEndBoundary - virtAddr,
-                             kmallocLength >> MMU_DESCRIPTOR_L2_SMALL_SHIFT,
-                             flags);
+                            SYS_MEM_BASE + bssEndBoundary - virtAddr,
+                            kmallocLength >> MMU_DESCRIPTOR_L2_SMALL_SHIFT,
+                            flags);
     if (status != (kmallocLength >> MMU_DESCRIPTOR_L2_SMALL_SHIFT)) {
         VM_ERR("mmap failed, status: %d", status);
         return;
diff --git a/arch/arm/arm/src/los_exc.c b/arch/arm/arm/src/los_exc.c
index d0c73bfe4a27e8c0a8db903944804d64da311352..2c05b21a780892a5c5ddc1573bc95ba8aad3c728 100644
--- a/arch/arm/arm/src/los_exc.c
+++ b/arch/arm/arm/src/los_exc.c
@@ -38,7 +38,6 @@
 #include "los_excinfo_pri.h"
 #endif
 #include "los_sys_stack_pri.h"
-#include "los_stackinfo_pri.h"
 #ifdef LOSCFG_COREDUMP
 #include "los_coredump.h"
 #endif
@@ -723,7 +722,7 @@ VOID BackTraceSub(UINTPTR regFP)
         }
         backLR = *(UINTPTR *)(UINTPTR)kvaddr;
 #else
-	backLR = *(UINTPTR *)(UINTPTR)kvaddr;
+        backLR = *(UINTPTR *)(UINTPTR)kvaddr;
         if (IsValidFP(tmpFP - POINTER_SIZE, stackStart, stackEnd, &kvaddr) == FALSE) {
             PrintExcInfo("traceback backFP check failed, backFP: 0x%x\n", tmpFP - POINTER_SIZE);
             return;
@@ -1007,7 +1006,7 @@ STATIC VOID OsCheckAllCpuStatus(VOID)
 
         OsWaitOtherCoresHandleExcEnd(currCpuID);
     } else {
-        if (g_excFromUserMode[g_currHandleExcCpuID] == TRUE) {
+        if ((g_currHandleExcCpuID < LOSCFG_KERNEL_CORE_NUM) && (g_excFromUserMode[g_currHandleExcCpuID] == TRUE)) {
             g_currHandleExcCpuID = currCpuID;
             LOS_SpinUnlock(&g_excSerializerSpin);
             target = (UINT32)(OS_MP_CPU_ALL & ~CPUID_TO_AFFI_MASK(currCpuID));
diff --git a/compat/posix/src/time.c b/compat/posix/src/time.c
index 71870721f83f0b6ce80d085c4aef5a0c61a5bc0e..865f8dbdfc9656b4485cdecacc45eeeb56dbbef1 100644
--- a/compat/posix/src/time.c
+++ b/compat/posix/src/time.c
@@ -456,7 +456,7 @@ static int PthreadGetCputime(clockid_t clockID, struct timespec *ats)
 {
     uint64_t runtime;
     UINT32 intSave;
-    UINT32 tid = ((UINT32) ~((clockID) >> CPUCLOCK_ID_OFFSET));
+    UINT32 tid = ((UINT32) ~((UINT32)(clockID) >> CPUCLOCK_ID_OFFSET));
 
     if (OS_TID_CHECK_INVALID(tid)) {
         return -EINVAL;
@@ -482,7 +482,7 @@ static int ProcessGetCputime(clockid_t clockID, struct timespec *ats)
 {
     UINT64 runtime;
     UINT32 intSave;
-    const pid_t pid = ((pid_t) ~((clockID) >> CPUCLOCK_ID_OFFSET));
+    const pid_t pid = ((pid_t) ~((UINT32)(clockID) >> CPUCLOCK_ID_OFFSET));
     LosProcessCB *spcb = NULL;
 
     if (OsProcessIDUserCheckInvalid(pid) || pid < 0) {
@@ -524,7 +524,7 @@ static int GetCputime(clockid_t clockID, struct timespec *tp)
 static int CheckClock(const clockid_t clockID)
 {
     int error = 0;
-    const pid_t pid = ((pid_t) ~((clockID) >> CPUCLOCK_ID_OFFSET));
+    const pid_t pid = ((pid_t) ~((UINT32)(clockID) >> CPUCLOCK_ID_OFFSET));
 
     if (!((UINT32)clockID & CPUCLOCK_PERTHREAD_MASK)) {
         LosProcessCB *spcb = NULL;
diff --git a/fs/fat/os_adapt/fatfs.c b/fs/fat/os_adapt/fatfs.c
index 06c33d57158e39382d2e6f960bf47283251655f0..0330388e52488bfe6917c78967870ac442d5bcc5 100644
--- a/fs/fat/os_adapt/fatfs.c
+++ b/fs/fat/os_adapt/fatfs.c
@@ -238,7 +238,8 @@ static mode_t fatfs_get_mode(BYTE attribute, mode_t fs_mode)
     return fs_mode;
 }
 
-static enum VnodeType fatfstype_2_vnodetype(BYTE type) {
+static enum VnodeType fatfstype_2_vnodetype(BYTE type) 
+{
     switch (type) {
         case AM_ARC:
             return VNODE_TYPE_REG;
@@ -286,7 +287,7 @@ static FRESULT init_cluster(DIR_FILE *pdfp, DIR *dp_new, FATFS *fs, int type, co
     mem_set(dir, 0, SS(fs));
     if (type == AM_LNK && target) {
         /* Write target to symlink */
-        strcpy_s((char *)dir, SS(fs), target);
+        (void)strcpy_s((char *)dir, SS(fs), target);
     } else {
         /* Write the dir cluster */
         mem_set(dir, 0, SS(fs));
diff --git a/fs/include/fs/file.h b/fs/include/fs/file.h
index cb05f0bca8e91f0541b5fdac5a4696d609a4eeb3..11b78782d724f2963361c017065699a56f542c95 100644
--- a/fs/include/fs/file.h
+++ b/fs/include/fs/file.h
@@ -473,7 +473,7 @@ off64_t file_seek64(struct file *filep, off64_t offset, int whence);
  *
  ****************************************************************************/
 
-int files_allocate(struct Vnode *vnode, int oflags, off_t pos,void *priv, int minfd);
+int files_allocate(struct Vnode *vnode, int oflags, off_t pos, void *priv, int minfd);
 
 /****************************************************************************
  * Name: files_close
diff --git a/fs/vfs/operation/fs_file.c b/fs/vfs/operation/fs_file.c
index 245d8f5dec773960b26da06dbc7f656384c262b3..1e600bbb2501f0ff7b340a60f7a60312b4263c64 100644
--- a/fs/vfs/operation/fs_file.c
+++ b/fs/vfs/operation/fs_file.c
@@ -406,7 +406,7 @@ int CopyFdToProc(int fd, unsigned int targetPid)
         return -ESRCH;
     }
 
-    procFd = AssignProcessFd(fdt, 3);
+    procFd = AssignProcessFd(fdt, 3); // minfd is 3
     if (procFd < 0) {
         if (sem_post(&semId) == -1) {
             PRINT_ERR("sem_post error, errno %d \n", get_errno());
diff --git a/kernel/base/ipc/los_signal.c b/kernel/base/ipc/los_signal.c
index 5366e56e33c0fdefc43e5b89867d3de4f11b44b6..43285ad4945b17a2ab7366783c954a422e18be52 100644
--- a/kernel/base/ipc/los_signal.c
+++ b/kernel/base/ipc/los_signal.c
@@ -134,7 +134,7 @@ int OsTcbDispatch(LosTaskCB *stcb, siginfo_t *info)
     if (masked) {
         /* If signal is in wait list and mask list, need unblock it */
         if (LOS_ListEmpty(&sigcb->waitList)  ||
-           (!LOS_ListEmpty(&sigcb->waitList) && !OsSigIsMember(&sigcb->sigwaitmask, info->si_signo))) {
+            (!LOS_ListEmpty(&sigcb->waitList) && !OsSigIsMember(&sigcb->sigwaitmask, info->si_signo))) {
             OsSigAddSet(&sigcb->sigPendFlag, info->si_signo);
         }
     } else {
@@ -310,7 +310,7 @@ int OsSigProcessSend(LosProcessCB *spcb, siginfo_t *sigInfo)
         .receivedTcb = NULL
     };
 
-    if (info.sigInfo == NULL){
+    if (info.sigInfo == NULL) {
         return -EFAULT;
     }
 
diff --git a/kernel/base/vm/los_vm_filemap.c b/kernel/base/vm/los_vm_filemap.c
index c248d3de907b4e6877c2417aeffe8924ff753d08..18ffe1174fffcd82e4bf0bdb9a5273b5f73ea1b4 100644
--- a/kernel/base/vm/los_vm_filemap.c
+++ b/kernel/base/vm/los_vm_filemap.c
@@ -46,7 +46,7 @@
 #endif
 
 #ifndef UNUSED
-#define UNUSED(x)          (VOID)x
+#define UNUSED(x)          (VOID)(x)
 #endif
 
 #ifdef LOSCFG_DEBUG_VERSION
diff --git a/kernel/base/vm/los_vm_iomap.c b/kernel/base/vm/los_vm_iomap.c
index dde9e472d8179033c6abf47c6fd08c10f28ccd82..5acc88fd7bf41379ddb718edee9e0e02bc3b32ad 100644
--- a/kernel/base/vm/los_vm_iomap.c
+++ b/kernel/base/vm/los_vm_iomap.c
@@ -34,7 +34,6 @@
 #include "los_vm_zone.h"
 #include "los_vm_common.h"
 #include "los_vm_map.h"
-#include "los_vm_lock.h"
 #include "los_memory.h"
 
 
diff --git a/kernel/common/console.c b/kernel/common/console.c
index 461025cb95d69076de8e726262f5fdc4453b1e40..353e98c34d8b26e8f4be84636dfd31bee6d65b4f 100644
--- a/kernel/common/console.c
+++ b/kernel/common/console.c
@@ -437,10 +437,10 @@ STATIC VOID StoreReadChar(CONSOLE_CB *consoleCB, char ch, INT32 readcount)
 
 VOID KillPgrp()
 {
-    INT32 consoleId = -1;
+    INT32 consoleId;
     LosProcessCB *process = OsCurrProcessGet();
 
-    if ((process->consoleID > CONSOLE_NUM -1 ) || (process->consoleID < 0)) {
+    if ((process->consoleID > CONSOLE_NUM - 1) || (process->consoleID < 0)) {
         return;
     }
 
@@ -872,7 +872,7 @@ STATIC INT32 ConsoleGetTermios(unsigned long arg)
         return -EFAULT;
     }
 
-    if(LOS_ArchCopyToUser((VOID *)arg, &consoleCB->consoleTermios, sizeof(struct termios)) != 0) {
+    if (LOS_ArchCopyToUser((VOID *)arg, &consoleCB->consoleTermios, sizeof(struct termios)) != 0) {
         return -EFAULT;
     } else {
         return LOS_OK;
diff --git a/kernel/common/los_config.c b/kernel/common/los_config.c
index adfafd70766ba560e491b9576a15f5b32f14d738..d99161abf2dd9e15afd344918855406bb765a1b6 100644
--- a/kernel/common/los_config.c
+++ b/kernel/common/los_config.c
@@ -83,7 +83,7 @@ LITE_OS_SEC_TEXT_INIT STATIC UINT32 EarliestInit(VOID)
 
 LITE_OS_SEC_TEXT_INIT STATIC UINT32 ArchEarlyInit(VOID)
 {
-    UINT32 ret = LOS_OK;
+    UINT32 ret;
 
     /* set system counter freq */
 #ifndef LOSCFG_TEE_ENABLE
diff --git a/kernel/common/los_magickey.c b/kernel/common/los_magickey.c
index 7e5f00ee5c05d9a2192311d1c3dd8b9fa99a1cc3..9368f77fa48e30d557552dfa737ff9b174fcb235 100644
--- a/kernel/common/los_magickey.c
+++ b/kernel/common/los_magickey.c
@@ -137,7 +137,7 @@ INT32 CheckMagicKey(CHAR key)
             PRINTK("Magic key off\n");
         }
         return 1;
-    } else if (key == 0x03){ /* ctrl + c */
+    } else if (key == 0x03) { /* ctrl + c */
         KillPgrp();
         return 0;
     }
diff --git a/syscall/misc_syscall.c b/syscall/misc_syscall.c
index 29b571d94806959240c0abc144c64dafc341013b..936d48cc82c2e63c9fce8f203c63cea8fed5d907 100644
--- a/syscall/misc_syscall.c
+++ b/syscall/misc_syscall.c
@@ -35,7 +35,6 @@
 #include "sys/resource.h"
 #include "sys/times.h"
 #include "sys/utsname.h"
-#include "time.h"
 #include "capability_type.h"
 #include "capability_api.h"
 #include "los_process_pri.h"