diff --git a/components/ota/aiot_ota_api.c b/components/ota/aiot_ota_api.c
index a9363bb5cceb3bd3908bbaa2813bcb6e071fdd43..85f4083488ccbd3b10ff50435df4a547bdfe9bed 100644
--- a/components/ota/aiot_ota_api.c
+++ b/components/ota/aiot_ota_api.c
@@ -830,6 +830,13 @@ int32_t aiot_download_send_request(void *handle)
         uint32_t renewal_start = range_start + download_handle->range_size_fetched;
         core_int2str(renewal_start, range_start_string, &range_start_string_len);
 
+	/* 
+         * add by fzy 2021-12-10 
+         * 当下载过程中出现链路层异常时(弱网下出现)，上层仍会循环下载
+         * 这会导致本次range下range_size_fetched的持续累加，需要重新初始化range_size_fetched
+         */
+        download_handle->range_size_fetched = 0;
+
         /* 对于按照range下载的情况, 即range_end不为0的情况, 需要将其翻译成字符串 */
         if (0 != range_end) {
             core_int2str(range_end, range_end_string, &range_end_string_len);