Abstract: This paper focuses on the frequent occurrence of disasters on the high and steep consequent rock slopes in southwestern China. Previous studies rarely reflected the deformation and stability of the consequent rock slopes under different conditions. Taking a high and steep consequent rock slope in Southwest China as an example, a finite-difference numerical simulation model was constructed, and the joint constitutive model and strength reduction method were used, so as to systematically study the characteristics of the deformation field, stress field and plastic zone distribution of rock slope, as well as coefficients of safety of slope stability. The results show that the unloading spring back deformation caused by the excavation of the consequent rock slope is mainly concentrated in the middle and lower part of the slope and near the excavation surface. The excavated slope was generally in a compressive stress state. The newly-added plastic zone of the rock slope after excavation is mainly located on the excavated surface and the toe of the slope.The potential slip path of the rock slope is composed of two parts. The slip path along the bedding plane and the shear slip path is inside the rock mass. The shear outlet of the rock slope is approximately 13 m above the foot of the slope.The coefficients of safety of the rock slope under the excavation, support and rainfall conditions are 1. 43, 1. 43 and1. 15 respectively. Namely, the overall stability of the consequent rock slope in this paper is better.