Abstract: To study the relationship between abutment pressure and the gas permeability of xinan coal mine 二1 coal seam，in-situ test study were carried out. By analyzing the change rule of abutment pressure, fitting to get the gauss distribution, using face of front position, the relationship between the abutment pressure and gas flow is established, Through the analyzing found that the abutment pressure has significant effects for the gas permeability, abutment pressure for gas permeability has a certain impact, gas flow rate is reduced, as the bearing pressure increased in the minimum, the abutment pressure peak abutment pressure is reduced, the gas velocity increased. This also for the gas extraction from borehole layout provides a theoretical basis.