diff --git a/kernel/common/blackbox/los_blackbox_common.c b/kernel/common/blackbox/los_blackbox_common.c
index c7ae0795..813ab8d9 100644
--- a/kernel/common/blackbox/los_blackbox_common.c
+++ b/kernel/common/blackbox/los_blackbox_common.c
@@ -78,6 +78,7 @@ int FullWriteFile(const char *filePath, const char *buf, size_t bufSize, int isA
         totalToWrite -= writeThisTime;
         totalWrite += writeThisTime;
     }
+    (void)fsync(fd);
     (void)close(fd);
 
     return (totalWrite == (int)bufSize) ? 0 : -1;
@@ -124,4 +125,4 @@ bool IsLogPartReady(void)
 {
     return TRUE;
 }
-#endif
\ No newline at end of file
+#endif