In order to analyze the deformation influence of a multi-tower with large chassis induced by adjacent foundation pit excavation, a three-dimensional finite element model was established by using the Midas/GTS.The results show that the excavation will cause the lateral displacement and settlement of the pile foundation, which, with the increase of excavation depth, will increase continuously. In addition, the nearer the foundation pit, the greater the lateral displacement and settlement of the pile foundation. The deformations of the raft and the superstructure are symmetrical during the whole process of excavation. With the increase of excavation depth, the deformation at the raft middle is larger than that near the edge of the raft, and shows a "half dish" shape. There is obvious concave deformation of the large chassis near the center of the foundation pit, while the large chassis near the edge of the foundation pit has slight uplift deformation.