diff --git a/kernel/extended/blackbox/los_blackbox_common.c b/kernel/extended/blackbox/los_blackbox_common.c
index 3e3ef8e6dc2bb90d172698b4806afdb55accc9f2..471861b0f57e77adc36ba2a5212b041b199b75c3 100644
--- a/kernel/extended/blackbox/los_blackbox_common.c
+++ b/kernel/extended/blackbox/los_blackbox_common.c
@@ -43,7 +43,8 @@
 
 /* ------------ local macroes ------------ */
 #ifdef LOSCFG_FS_VFS
-#define BBOX_DIR_MODE 0777
+#define BBOX_DIR_MODE 0750
+#define BBOX_FILE_MODE 0640
 #endif
 
 /* ------------ local prototypes ------------ */
@@ -69,7 +70,7 @@ int FullWriteFile(const char *filePath, const char *buf, size_t bufSize, int isA
         BBOX_PRINT_ERR("log path [%s] isn't ready to be written!\n", LOSCFG_BLACKBOX_LOG_ROOT_PATH);
         return -1;
     }
-    fd = open(filePath, O_CREAT | O_RDWR | (isAppend ? O_APPEND : O_TRUNC), 0644);
+    fd = open(filePath, O_CREAT | O_RDWR | (isAppend ? O_APPEND : O_TRUNC), BBOX_FILE_MODE);
     if (fd < 0) {
         BBOX_PRINT_ERR("Create file [%s] failed, fd: %d!\n", filePath, fd);
         return -1;
@@ -216,4 +217,4 @@ int CreateLogDir(const char *dirPath)
     (void)dirPath;
     return -1;
 }
-#endif
\ No newline at end of file
+#endif