Jiuhuashan Bridge in Chengde, which spans the Wulie River, the main river in the urban area, is a multi-span butterfly special-shaped arch bridge and a new type of spatial composite structure system with distinctive characteristics. Taking Jiuhuashan Bridge as the background project, this paper introduces the design and layout of butterfly special-shaped arch bridge, analyzes the system characteristics of the bridge structure. Through the plane and space static calculation, it shows that the stress of the whole bridge structure is reasonable, and the stress storage of arch section, suspender and V-shaped structure box girder is moderate. The displacement of each span meets the specification requirements. The dynamic structure analysis and calculation of the main bridge show that the internal and external stiffness of each span meets the design requirements. The critical load stability coefficient of the first instability mode is greater than 5. The possibility of the first class instability of the structure is very small, and the spatial stability meets the design requirements.