Abstract:The creep equation was described by fractal dimension of equivalent stress and time according to the shear creep properties of soil;and the calculated creep parameters were fitted combing with experimental creep curves of soil in Shanghai. Based on a 200 m×140 m large excavating pit of South Square of Shanghai South Railway Station,finite element method(FEM) was used to analyze the creep deformation,shear stress relaxation and creep strain change rules of slope during the construction process. The results show that it is feasible to adopt exponential creep equation to calculate the creep of cutting slope under the condition of long-time exposure of soft soil pit;the soil takes on damp creep under the condition of this project;the horizontal creep at the foot of the slope is larger than that at the top;the deformation at the top of the slope can meet the requirement of the project when using middle board as support. Key words: