Abstract: In the rapid development of urban rail transit construction, many important risk sources such as the large number of super deep and large foundation pit projects close to scenic spots, rivers and existing buildings will certainly emerge. In this paper, the finite element analysis software MIDAS/GTS is used to calculate the deformation of enclosure structure and analyze the influence of surrounding environment for the designed and constructed Sports Park Station on Nantong rail transit Line 2, and the foundation pit excavation in a plot development project in the same period, the latter adopts combined pit excavation and separate pit excavation. Combined with the characteristics and actual situation of the projects, the implementation scheme of separate pit excavation is finally determined which has the lowest comprehensive risk.