Abstract: In order to clarify the extent of the effect of underground goaf on surface structures, a three-dimensional geological model is constructed by using Dimine software, a digital mine software, and Midas GTS NX, a geotechnical finite element analysis software.By means of FLAC^3D software, the rock movement and the affected areas after mining are analyzed by simulation.According to the size of the surface movement deformation value and relevant regulations, the influence degree of the surface structures is determined reasonably, and the surface influence range is delimited according to the boundary angle.The results show that the surface tilt, curvature and horizontal deformation caused by the underground goaf will not affect the surface structures, at the same time, the circumscribed surface the affected areas have certain credibility and can provide references for similar projects.