Abstract: The unloading effect during the excavation process of a foundation pit will cause the rebound deformation of its bottom, and the influences of the existence of engineering piles on the rebound deformation of the foundation pit cannot be ignored. Based on a long and large tunnel project, by using the finite element software PLAXIS 3D and simulating different working conditions, the influences of engineering piles in the pit on the rebound deformation of the foundation pit are studied. The results show that the pile length, pile diameter, and pile stiffness of the engineering piles have significant influences on the rebound deformation of the foundation pit within a certain range, but the influences are not obvious after a certain range. Therefore, reasonable selection of parameters of the engineering piles can achieve effective control of the rebound deformation of the foundation pit.