Ship navigation safety will be greatly influenced by the obstruction due to bridge group.Based on generalized meandering river with bridge group,the corresponding relationship between bridge span and distance is confirmed using the ship maneuvering motion simulation method.Considering the actual conditions of the river,the general coupling relationship between the distance and span is obtained.Taking Dengjiaba bridge group of Tuojiang river in Sichuan province for example,the feasibility of the proposed site and span layout scheme of Dengjiaba bridge is proved by the obtained general coupling relationship.Moreover,the navigation condition of Caiyuanba bridge group reach of the Yangtze River is evaluated.