In order to solve low permeability of gas mine coal seam difficult gas extraction problem, 12706 working face of Taoyi Mine was taken as the study background, high pressure hydraulic fracturing test was conducted, through the analysis of test before and after the hydraulic pressure in gas drainage volume change and the influence of hydraulic fracturing, water injection technology and drilling parameters, etc. were settled, experimental result was widely applied in the working face, during mining and return in upper corner gas concentration was not out of limits, which ensured the safety production of working face.