Abstract: In order to study the laws of ground movement and deformation induced by underground filling mining in western open-pit mine, the finite element method is used to carry out numerical simulation study. The influence of the ground surface movement and deformation after the excavation and filling in different areas is analyzed. The value of the surface subsidence and horizontal displacement after mining is obtained, and the value of the phase deformation is calculated, and the influence ranges of movement angle and surface movement deformation are predicted. The results show that with the continuous mining of the mining area, the surface subsidence, the horizontal displacement, the slope deformation, the curvature and the horizontal deformation are all increasing, the mining influence range is gradually increasing, and the boundary line is finally determined to be around N1400, that is, in the pit, the surrounding buildings will not be affected.