Abstract: As an effective deformation control method, passive zone reinforcement has been widely used in excavation construction of adjacent subway tunnels. Based on the deep foundation pit project of an all-buried sewage treatment plant in Wuhan City, three-dimensional finite element was used to establish an overall model including foundation pit supporting structure, underground box structure, engineering piles in the pit and adjacent tunnels, and the influence of foundation pit excavation on adjacent tunnels under actual construction conditions was analysed. The effects of empty pile part and solid pile part of passive zone reinforcement and engineering pile on subway tunnel deformation was compared. The results show that solid pile and empty pile of passive zone reinforcement and engineering pile have certain control effect on the horizontal displacement of the diaphragm wall and the horizontal displacement of the adjacent tunnel, and the engineering pile has the most significant influence. The empty pile of passive zone reinforcement has little influence on the vertical displacement of the diaphragm wall and the adjacent tunnel. The solid pile of passive zone reinforcement and engineering pile can greatly reduce the heave of the bottom soil, but increase the vertical heave of the diaphragm wall and the adjacent tunnel. The construction of exterior-protected system and the excavation of the foundation pit cause the horizontal displacement and vertical heave deformation of the tunnel towards the foundation pit, while the construction of the main structure has an obvious inhibition effect on the heave of the existing tunnel. The deformation of tunnel can meet the deformation control requirements during the whole foundation pit construction, which indicates that the displacement control method adopted in the design of foundation pit are practical and effective.