Abstract:The geological conditions of the open pit slope are complex and the factors affecting landslide are diverse. With the development of the open pit ore body, the slope form and mining mechanical response state will change, etc. Therefore, it is necessary to conduct a comprehensive evaluation on the evolution of the landslide risk area in combination with the actual working conditions and taking into account the mining depth and other factors. Based on geological prospecting data and contour model of open-pit, the numerical calculation model open-pit in 2023-2026 was established by using 3Dmine-Rhino7-FLAC3D and other software. The mechanical response of the slope under mining disturbance is analyzed by combining field monitoring and numerical simulation. The stress-strain analysis results were extracted, and the slope risk areas in 2023-2026 were comprehensively evaluated by weighted information method combined with slope, elevation, slope direction and other indexes, and their evolution rules were explored. The results show that the numerical simulation results of 2023 mining stope are in good agreement with the field monitoring results. During the mining process, the stress is gradually transferred to the main mining area, and the slope deformation increases gradually. The comprehensive evaluation of landslide risk was carried out considering factors such as mining mechanical response and geological conditions, and the evolution and expansion law of the risk area in the mining process was in good agreement with the mining process, and the general evolution result of the high-risk area was finally obtained: the high-risk area first grew in the north and northwest slope, gradually advanced to the west and southwest slope, and finally expanded to the southeast slope.