Abstract: Taking Shanghai subway tunnel as an example, a model of leakage at shield tunnel joint was established with the finite element software to investigate the deformation and inner force of the shield tunnel by considering different seepage boundaries. The results indicate that the distribution of pore pressure, ground settlement, deformation of tunnel and inner force all vary significantly with different seepage boundaries and permeability coefficients, and the duration reaching steady leakage are also different. The developments of surface settlement, tunnel diameter variation and internal force with the pore pressure are almost the same. The leakage at joint can result in a significant decrease of pore pressure around the tunnel joints, the more serious the leakage is, the larger the pore pressure difference is. In an extreme case of high-permeability of tunnel joints and no extra groundwater, the pore pressure, surface settlement, tunnel deformation, internal force, and bending moment will be in a continuous variation with significant amplitude, which may pose a severe threat on the safe operation of the subway.