Abstract: Based on analyzing the mechanism and application effect of various hydraulic measures, the article divides hydraulic measures into two categories of plugging gas and emissions gas in accordance with the mechanism and effect of "water" on coal seam gas. According to the classification, taking hydraulic cutting seam, hydraulic fracturing and coal seam water injection as the representative, the article studies the mechanism action and application effect of three kinds of hydraulic measures in coal gas control, and analyzed the advantages and problems of various measures. Finally, it presented the integrated hydraulic technology of "drilling, cutting, pressing, releasing, injectng " that takes "long drill aperture to guide, deep kerf lateral guidance, large flow of fracturing permeability improvement, rapid and efficient extraction of free gas at an early stage; low pressure injection, the overall uniform wetting of coalbed, inhibition of residual gas in the later stages" as the core.