Shiwei is an important and unique system in the Qing dynasty, but the research about this issue is quite scarce. In this article the author corrects many errors about the shiwei system in the Qing dynasty; for instance, yu qian shiwei and Qianqingmen shiwei are also divided into four levels, qianfeng shiwei does not belong to the shiwei system, toudeng shiwei is equivalent to yideng shiwei, sideng shiwei is not only for dismissing zongshi shiwei down to the lower level. Additionally, this article checks the definition of damen shiwei, which has never been discussed or explained before. And also, after checking lots of chronicles and other historical archives, the author supposes there are two definitions of yuqian shiwei, depending on the contexts and historical situations.