Tunneling in complex geotechnical conditions and in built-up urban areas is becoming widespread. The stability of the tunnel excavation zone is closely related to the construction process and the safety of adjacent buildings. For the stability of slurry shield tunneling face, an attempt is made to propose an analytical solution with pore pressure distribution field and to assess the stability of the excavation zone of shield tunnel based on upper bound solution. The proposed method incorporates the coupling effect of slurry infiltration while considering groundwater seepage. The safety factors and the support pressure that influenced by the slurry transform rate are analyzed.