diff --git a/arch/arm/arm/src/strncpy_from_user.c b/arch/arm/arm/src/strncpy_from_user.c
index 70c98bc9867d6b315c21b883ddec2a92af00ed17..0e400ce36edecb23d6a3651a53a7ef9b82fbf16a 100644
--- a/arch/arm/arm/src/strncpy_from_user.c
+++ b/arch/arm/arm/src/strncpy_from_user.c
@@ -46,7 +46,7 @@ INT32 LOS_StrncpyFromUser(CHAR *dst, const CHAR *src, INT32 count)
     }
 
     maxCount = (LOS_IsUserAddressRange((VADDR_T)(UINTPTR)src, (size_t)count)) ? \
-                count : (USER_ASPACE_TOP_MAX - (UINTPTR)src);
+                count : (INT32)(USER_ASPACE_TOP_MAX - (UINTPTR)src);
 
     for (i = 0; i < maxCount; ++i) {
         if (LOS_GetUser(&character, src + offset) != LOS_OK) {
diff --git a/fs/vfs/operation/vfs_fallocate64.c b/fs/vfs/operation/vfs_fallocate64.c
index 0560feef5d387b334f4a6fde10a05d2240c43171..86430230230d3ca707b6021ead5df4d0c6c7ee22 100644
--- a/fs/vfs/operation/vfs_fallocate64.c
+++ b/fs/vfs/operation/vfs_fallocate64.c
@@ -134,7 +134,7 @@ int fallocate64(int fd, int mode, off64_t offset, off64_t len)
         return VFS_ERROR;
       }
 
-    if (filep->f_oflags & O_DIRECTORY)
+    if ((unsigned int)filep->f_oflags & O_DIRECTORY)
       {
         set_errno(EBADF);
         return VFS_ERROR;
diff --git a/kernel/extended/liteipc/hm_liteipc.c b/kernel/extended/liteipc/hm_liteipc.c
index f23c6894a0ca5dbfcee5c2ea3aa912bd73797f93..0e714f2c40f3eb38d063c72a65584a210e519ca1 100644
--- a/kernel/extended/liteipc/hm_liteipc.c
+++ b/kernel/extended/liteipc/hm_liteipc.c
@@ -1216,12 +1216,12 @@ LITE_OS_SEC_TEXT int LiteIpcIoctl(struct file *filep, int cmd, unsigned long arg
             }
             ret = LiteIpcMsgHandle((IpcContent *)(UINTPTR)arg);
             if (ret != LOS_OK) {
-                return ret;
+                return (int)ret;
             }
             break;
         default:
             PRINT_ERR("Unknow liteipc ioctl cmd:%d\n", cmd);
             return -EINVAL;
     }
-    return ret;
+    return (int)ret;
 }
diff --git a/platform/los_hilog.c b/platform/los_hilog.c
index b26e279318730c4128f6b4f604cfb5aed1e70e10..4185aaab2f52eadab843fb3248b1a717b337ad59 100644
--- a/platform/los_hilog.c
+++ b/platform/los_hilog.c
@@ -148,7 +148,7 @@ static int HiLogBufferCopy(unsigned char *dst, unsigned dstLen, unsigned char *s
 
 static int HiLogReadRingBuffer(unsigned char *buffer, size_t bufLen)
 {
-    size_t retval;
+    int retval;
     size_t bufLeft = HILOG_BUFFER - g_hiLogDev.headOffset;
     if (bufLeft > bufLen) {
         retval = HiLogBufferCopy(buffer, bufLen, HiLogBufferHead(), bufLen);