Gas drainage from low permeability coal seams has been confronted many problems, such as great drainage difficulty, low gas drainage efficiency and so on. This paper was aim at using hydraulic punching to increase coal seam permeability and enhance gas drainage. A damage-seepage coupling model was built based on multiphysics and damage theory, and numerical simulations of gas drainage in the 17220 panel of No.12 coal of Pingdingshan, and draw a conclusion that the radius of effective influence extraction was gradually increased with the water injection pressure. But when the pressure goes up to some extent, the range of the radius was decreased. At the same time, through this work, we determined the injection pressure and the way of drilling, also applied in the engineering tests. The results show that the average of the gas drainage concentration and fluxes are 60% , 0.087,2.07 times and 2.9 times as much as that in non- punching zone respectively, that the permeability of coal seam is increased by 13.5 times. Beyond that the residual gas content declined below proof, the outburst elimination effect is good.