Abstract: In order to prevent the adjacent light rail bridge piles in operation from the deep foundation pit excavation of the subway, relying on the Dalian Metro Line 5 station project, the finite element software Midas-GTS numerical simulation and field monitoring data are used to compare and analyze the influence of deep foundation pit excavation on adjacent bridge piles.The variation law of lateral movement of adjacent bridge piles is studied under different distance of foundation pit and bridge piles, different stiffness of retaining wall and reinforcement measures.The research results shown that the greater the distance between the foundation pit and the bridge pile and the greater the rigidity of the retaining wall, the smaller the side displacement of the pile body; The adoption of triple-tube high-pressure jet-grouting pile reinforcement measures reduced the additional displacement of the pile by 49.05%, and reduced it to within the requirements of the urban railway bridge code in the end.The research conclusion of excavation can provide some references for the influence of deep foundation pit excavation on adjacent bridge piles during the similar projects.