Abstract: Based on the construction drawing design of Huaxihu Bridge of Rail Transit Line 6 in certain city, the bridge type scheme and main bridge structure design of single arch rib continuous beam-arch composite structure is introduced. Then detailed static and dynamics analysis of the structure system is carried out. The results show that the single arch rib continuous beam-arch composite structure has good static and dynamics performance, and its structural strength, stress, stiffness, overall stability and dynamics effect all meet the design requirements. It is a suitable type for designing rail transit bridge.