Abstract: According to the key difficulties faced to the coal mining in deep gassy seam in China,the paper summarized and analyzed research status of the gas contro I with mine hydraulic technology in China coal mine and pointed out that the hydraulic technology would be the key technology to the pressure releasing of deep high gassy outburst seam and the regional gas control. With an analysis on the hydraulic fracturing,hydraulic slotting,hydraulic punching and other hydraulic technologies of the pressu re releasing and permeability improvement and the mechanism,technical technique, engineering practices to eliminate the gas outburst danger and other main progresses,t he paper found that the key scientific unsolved problems in present hydraulic technology and provided the main contents to be studied to provide an orientation for the dev elopment of hydraulic technology.