During the construction process, many foundation pit projects are in the state of shutdown due to various reasons. In order to study the key factors affecting the deformation law of the overdue foundation pit. A series of numerical simulations are conducted by using ABAQUS software taking the 2nd phase of the deep foundation pit in Hunan cultural square as an example. Simulation results indicate that the ground load has influence on the deformation during the whole stage of foundation pit excavation. The influence of the embedment depth on the deformation is obvious during the excavation stage after the foundation pit is resumed. The excavation depth only affects the deformation during the excavation stage before the shutdown. The duration of shutdown has little effect on the deformation. Based on the research results, the optimization method for safe excavation of the overdue foundation pit is proposed.