This paper focuses on the replacement of the suspender of Shitanxi Bridge. Because some arch Bridges built in the early stage did not take into account the replacement of the boom during the operation of the bridge, the inner diameter of the embedded pipe matching with the bridge boom is mostly too small, which can not meet the technical requirements of the installation of the new boom anchor. Through the reasonable design of the structure and construction technology of the new boom, the installation and construction of the new boom can achieve the effect of not destroying the original structure of the bridge and convenient construction, which provides a feasible solution for similar bridge cable replacement projects.