Abstract: There are permanent joint maintenance shed, operation shed and throat area under the upper cover platform of metro depot, and the later upper cover property development conditions are reserved on the upper part of the platform. This paper is based on the liyuantou depot project of Tianjin metro line 5, in which the joint maintenance depot is the vehicle overhaul workshop shared by Tianjin metro lines 5 and 10. This paper summarizes and discusses the construction of large-span and large-area group towers, so as to provide technical reference for the construction of similar depot projects in the future.