Abstract: Based on the theory of mountain surface mining slip, combining with the measured data of a mine of Yangquan, by drawing mobile deformation graphs and making a detailed analysis, we has been illustrated impact of microrelief on mining subsidence law. The results showed that the essence of microrelief influence on mining subsidence law is the slip of mining, the influence range of mountain deformation is closely related to the morphology; the microrelief has a direct impact on the protection of coal pillar design.