Abstract: Underground mining of metal mines will cause surface subsidence，may produce cracks， collapse pits，etc.，causes damage to surface facilities such as houses，roads，optical cables，etc.，affects land use and vegetation growth，and then destroys the ecological balance. In order to study the influence of underground mining on the surface，based on the actual mining process of Xingshan Iron Mine，FLAC3D soft⁃ ware is used to simulate the filling process of ore body mining，a reasonable simulation scheme is estab⁃ lished and the mining simulation was carried out. The surface subsidence，horizontal deformation，inclina⁃ tion and curvature caused by mining are analyzed，and the influence of underground mining on the surface is comprehensively evaluated. The results show that the deep mining process of Xingshan Iron Mine can en⁃ sure that the surface deformation is within the controllable range，and has no obvious impact on the key proj⁃ ects. In the mining operation of ore bodies above -330 m，there is a certain degree of vertical displacement change in the open-pit slope. At the end of the mining operation of the -330~-480 m orebody，the vertical displacement of the open-pit slope perpendicular to the strike of the orebody did not change significantly compared with the completion of the mining of the orebody above -330 m. The research results provide a the⁃ oretical basis for the subsequent safe mining of the mine.

Key words: underground mine, numerical simulation, surface deformation