Abstract: In order to study the influence of 8 seam mining on the upper 11 seam, the methods of theoretical analysis and numerical calculation were used to study the change law of the displacement field and stress field of the upper 11 seam floor during ascending mining. The results shows that 11 seam is located in the curve subsidence zone of 8 seam mining, the coal body has certain damage, but it has a good continuity, and the stress of the upper coal seam is reduced because of the mining of the 14128 working face and the stress decreasing zone has formed; At the same time, the permeability of the 11 coal has increased, the gas pressure has reduced, and pressure-relaxing effect is obvious, and it provides protection for the safe mining of high gas 11 seam. At last, the influence range of pressure relief is calculated.