Abstract: In order to ensure the safety of large-scale open-pit mining in Xiushan Limestone Mine， this study comprehensively uses a variety of techniques and methods to analyze the stability of the open-pit slope under natural conditions，saturated conditions and saturated + seismic conditions. The geological con⁃ ditions and structural plane characteristics of the slope are investigated by means of UAV，3D laser scanner and photogrammetry，and the rock mass parameters are determined by indoor rock physical and mechanical tests. The theoretical calculation and numerical simulation are carried out by using limit equilibrium method ( Slide software )，finite element analysis method ( Phase2 software ) and wedge failure analysis ( Swedge software ). At the same time，the results are verified by the data of slope monitoring points in the west area of the west stope. The research shows that the slope stability coefficient under the three working conditions is greater than the required value of the specification. The slope monitoring in the west area of the west stope shows no signs of deformation and is in a stable state，which is consistent with the calculation conclusion. The reliability of theoretical calculation and numerical simulation is verified，which provides guidance for mine slope stability management.

Key words: open-pit slope, limit equilibrium method, finite element analysis, wedge damage, stabil? ity analysis