With the depth of coal mining increased, the intrinsic properties of coal seams (micro-porosity, low permeability and high adsorption) becoming more and more significantly. Because of the features of high adsorption, the accidents in coal production process occurred frequently and gas resources can not be effectively used. According to the technical achievements of high-pressure pulsed water jet cutting and drilling in the coal seam drilling to improve the gas extraction and cavitation sonic and temperature...