Abstract: Through analysis of the situation and seam stability in Donghuantuo mining south area, combining with Donghuantuo mining situation under building and domestic mining technology level at present, designed with mining width 60m, 70m wide left of strip mining, and is expected to surface subsidence and deformation movement. Dissertation uses FLAC3D finite difference method for numerical simulation. The design’s effect of movement deformation and surface subsidence is small. It ensure the destruction of the surface buildings in grade Ⅰ or less. Engineering Practice has proved that the accuracy of the simulation. To some extent, the design extend the service life of the mine, reduce coal production costs and improve the efficiency of coal production.