In view of the influence of seepage and unfavorable geologic condition on the stability of riverbank slope,we analyze the variation law of soil permeability coefficient with confining pressure,saturation density with confining pressure,shear strength of soil with water content and immersion time,construct an unstable numerical model of seepage damage,and probe into the effects of bank cracks,river water softening on the bank slope and rainfall infiltration on safety factor of bank slope.The results show that under the influence of single factor,rainfall infiltration has the greatest influence on bank slope stability,and the safety factor can be reduced by 9.9%,followed by softening effect of river water(2.8%)and bank slope cracks(1.9%).The results of soil-water coupling calculation show that the safety factor of bank slope decreases by 11.3%~21.5% under the combined influence of three factors.