Ground buildings constructed above metro station have increased very quickly due to the limited land resources in urban areas.In this paper,the seismic response of the Underground subway station-Surrounding soil massGround adjacent buildings (USG) system subjected to various seismic loading is studied through numerical analysis.The numerical model is established in terms of the calculation domain,boundary condition,and contact property between soil and structure based on the real project.The reciprocal influence between subway station and ground adjacent building,and their effects on the dynamic characteristics of surrounding soil mass are also investigated.Through the numerical study,it is found that the impact of underground structure on the dynamic characteristics of the surrounding soil mass depends on its own dimension,and the presence of underground structure has certain impact on the seismic response of ground adjacent building.Due to the presence of underground structure and ground adjacent building,the vertical acceleration generated by the USG system cannot be ignored.The outcomes of this study can provide references for seismic design of structures in the USG system.