In order to improve the gas drainage effect, watering hole anti-reflection technology was adopted in No. 2 coal seam -620 water warehouse air return roadway in Yangdong Mine. The result showed that coal seam was sliced by high pressured water, pressure relief body was formed, with increasing density of crack and permeability coefficient of coal seam, the concentration attenuation of borehole extraction concentration of coal seam is slow, and the concentration of gas extraction in coal seam is greatly increased, with average two to three times higher, gas extraction was improved from 0.009 m3 / min to 0.045 m3 / min, the scalar of gas drainage was quadrupled, φ94 mm crossing hole was adopted in No. 2 coal seam after high pressure water, with 15 d draining and 8 m maximum radius.