Generally,soft soil has a high water content and low shear strength,and most of the soil landslides occur in the rain or during a certain time after the rainfall,so it is of great significance to study the mechanism of rainfall infiltration induced soft soil slope failure.This paper selects a soft soil slope engineering as the research object,based on finite element strength reduction,using Abaqus software to establish the three dimensional finite element model of the soft soil slope，and analyzes the influence of slope stability on rainfall intensity and duration as well as saturated permeability coefficient.The results show that：Along with the rain infiltration the soil saturation and pore water pressure increase,the shallow soil matrix suction decrease or disappear,resulting in the reduction of soil shear strength and decrease of slope stability;The model of rainfall infiltration induced slope stability shows asymptotic traction damage,the plastic damage area first appears at the foot of the slope,and upwards along the slope face,and gradually forms a continuous plastic sliding surface;Continuous heavy rainfall easily leads to slope instability destruction.