Aiming at the problem of sewage pipeline leakage，the attenuation of soil strength parameters with the increase of saturation was simulated in ABAQUS platform with user defined USDFLD subroutine and the generalized soil strength formula. To evaluate the influence range of leakage on the ground surface，this paper analyzes the scope of saturated area by the leakage of sewage pipeline with different buried depths under the condition of the pipeline damage area change. Meanwhile, the variation of soil subsidence above pipelines and the stability of ground structure are also analyzed during 19 days after the leakage. The research results show that for the working condition with a buried depth of 1m，the influence range caused by leakage is the smallest，and the impact range caused by leakage is the largest when the buried depth is 2 m. If the substance is set to 30 mm as the threshold value of goound instability, the case with a buried depth of 1 m kept stable in the analysis time. With specified ground instability threshold values，the sewage pipelines with a depth of 25 m all experienced ground instability from deep to shallow in 15 to 19 days after the leakage occurred.