Abstract: The problem of water seepage in the joints will affect the structural stability of precast utility tunnels. It is very important for the later operation and maintenance to study the mechanical performance of the joint under the water seepage condition. In this paper,taking an actual utility tunnel project as an example,using Midas Gen,based on the K-ζ method in the technical code for urban utility tunnel engineering（ GB 50838-2015）,the section internal force of prestressed precast utility tunnel is analyzed. Through the physical experiment,the load value of water seepage on the upper and lower parts of the joint is obtained. Combined with the data simulation,the mechanical performance and anti-seepage ability of different cross sections of precast utility tunnel under this condition are studied,which provides theoretical basis and reference for the cross section design of utility tunnel under different geological conditions.