Abstract: In view of high and steep slopes in an open-pit quarry of a certain construction granite mine，a comprehensive analysis of the engineering geological characteristics and specific mining condi⁃ tions of the slopes was conducted. Typical slope sections in each zone were selected. The potential failure modes of the slopes were analyzed by using the red-flat projection method，and the stability of the slopes under groundwater and rainfall conditions was preliminarily analyzed by numerical simulation. Combining the limit equilibrium method and the finite element strength reduction method（SRM）in the Midas/GTS software，a systematic evaluation of slope stability under different working conditions is conducted，and corresponding management measures and suggestions are proposed. The research results show that the pos⁃ sibility of overall large-scale wedge-shaped failure of the slope is relatively small，and the main failure modes are two types: arc integral sliding and small wedge-shaped failure modes. After rainfall，rainwater seeped into the slope，and the infiltration line increased. During the rainy season，the rise of the slope in⁃ filtration line will affect the stability of the slope. The current slope of the mine is in a stable state. Shear failure is prone to occur at the lower part of the weathered rock strata and the foot of the deep mining slope. The simulation results of the limit equilibrium method and the finite intensity reduction method are consis⁃ tent，indicating the validity and rationality of the multi-method comprehensive analysis. The research re⁃ sults provide a basis for the formulation of slope stability protection measures and suggestions for this open�pit mining site.

Key words: open-pit mining area, slope stability, limit equilibrium method, finite element strength reduction method, slope protection