In order to further reveal the rainfall infiltration and stability evolution process of the bedrock-type stepped high-cut slope under rainfall cycle conditions, the bedrock-type stepped high-cut slope of a silty clay cover layer in the Mabian to Zhaojue section of the Lexi Expressway is taken as The research object was to establish a mathematical model for the deterioration of the shear strength parameters of the soil by carrying out the indoor dry-wet cycle test; the Geo-studio numerical simulation software was used to study the rainfall infiltration process of the high-cut slope under the multi-case rainfall cycle, which revealed different rainfall Under circulating conditions and after rain, the internal seepage field and stability change law of high-cut slopes were established, and the rainfall-induced high-cut slope stability coefficients deteriorated year by year; combined with laboratory tests and numerical simulation results, the prediction of such high-cut slope stability coefficients was established method. The research results show that the shape and position of the potential slip surface of the high-cut slope does not change significantly during the rainfall infiltration process, and it appears as a combined sliding surface at the depth of the high-cut slope and the water surface of the bedrock; the same rainfall time The rainfall infiltration depth and stability degradation amplitude of the internal high-cut slope are positively correlated with the rainfall intensity; the stability degradation effect of the high-cut slope is negatively correlated with the number of rainfall cycles; the greater the infiltration depth or the total amount of infiltration, the greater the rainfall The higher the stability coefficient of the high-cut slope is, the smaller the recovery coefficient is. It is relatively safe and reasonable to use the average value of the degradation coefficient of the shear strength parameter of the soil for the degradation coefficient of the high-cut slope stability coefficient. The research results have important scientific guidance significance and practical value for the evaluation, prediction and prevention of high-cut slope stability under repeated cycling and periodic rainfall conditions.