The Xinchang Chengxi Bridge is a reinforced concrete box type mid through suspension arch bridge, with the original suspension rods being 4 φ 15 steel strand cable body, replaced with equal strength principle φ 5-85 parallel steel wire ropes. Due to the original anchoring system not being suitable for the anchoring function requirements of the new cable, the new anchoring system adopts a fully welded hoop structure. When replacing the suspension rod, the principle of maintaining the same elevation and displacement is adopted for control