diff --git a/interfaces/innerkits/nativetoken/src/nativetoken.c b/interfaces/innerkits/nativetoken/src/nativetoken.c
index 8a5c12017340b6a915b0e9b2415c4d8b4330aeb0..ad1e6207f91de6f0ccbe51ac55245eb26138a951 100644
--- a/interfaces/innerkits/nativetoken/src/nativetoken.c
+++ b/interfaces/innerkits/nativetoken/src/nativetoken.c
@@ -38,6 +38,11 @@ int32_t GetFileBuff(const char *cfg, char **retBuff)
         return ATRET_FAILED;
     }
 
+    if (fileStat.st_size == 0) {
+        *retBuff = NULL;
+        return ATRET_SUCCESS;
+    }
+
     if (fileStat.st_size > MAX_JSON_FILE_LEN) {
         ACCESSTOKEN_LOG_ERROR("[ATLIB-%s]:stat file size is invalid.", __func__);
         return ATRET_FAILED;