Abstract: Based on the analysis of previous geological data, the geotechnical physical and mechanical test data and the relevant scientific research data of Baoqing Open-pit Coal Mine, by considering the influence of groundwater on the slope, the numerical simulation software FLAC3D is used to study the failure mode, stress distribution and displacement in rock mass of the west side slope, and it is obtained that the deformation and failure mode of the west side slope of stope is the type of “arc shear bedding slip”. The slope analysis software is used to study the slope stability for the west side of stope, and the stability of the west side slope in Baoqing Open-pit Coal Mine is studied quantitatively.