It has not been thoroughly investigated on influence of excavation to stepped slope stability and the corre-sponding slip surface. Taking a two-stepped slope as an example,by the finite element stress-based method of slope stability,the stepped slope stability and location of the potential slip surface were analyzed with excavation and without excavation respectively. At the same time,the highly disturbed zone due to excavation was analyzed. The results have shown that compared with the factor of safety without excavation,the factor of safety of the stepped slope with excavation tends to smaller;there is little influence of excavation on factor of safety of the whole stepped slope and the corresponding location of the potential slip surface. For design of the stepped slope,it is better for the width of platform to be greater than half of the average height of the upper and lower slopes;the height ratio of the upper slope to the lower slope should be in the range of 1 ~2;it is more favorable to the slope stability that the slope ratio of the lower slope is smaller than that of the upper slope.%关于开挖对阶梯型边坡稳定性及其潜在滑动面位置的影响，目前还缺乏系统研究。以二阶阶梯型均质挖方边坡为研究对象，利用基于有限元应力状态的边坡稳定性分析方法，分别对不考虑开挖效应和考虑开挖效应两种条件下阶梯型边坡的稳定性及其潜在滑动面特征进行了对比，同时对开挖强扰动区的分布特征进行分析。研究结果表明：1.与不考虑开挖效应时计算的边坡安全系数相比，考虑开挖效应后计算得到的边坡安全系数偏小；2.开挖对阶梯型边坡的整体安全系数及其潜在滑动面位置的影响较小；3.在阶梯型均质挖方边坡的设计中，其平台宽度宜大于其上下级坡高平均值的0.5倍，上下级边坡的坡高比宜控制在1~2范围，且下级边坡的坡率小于上级边坡坡率时更有利于边坡的整体稳定。
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