Abstract: During the process of mining through the fault group at the 3101 working face of Kexing Pingquan Coal Industry Co.Ltd.，local gas over-limit phenomena occurred. When traditional borehole gas drainage was adopted，technical problems such as a large number of boreholes，severe hole collapse，and poor gas drainage effect emerged. Through technical research，the gas drainage technology of the working face is optimized and designed，and the hydraulic cavitation enhancement technology is adopted. From the perspective of the actual application effect on site，the engineering volume of drilling construction in the working face has decreased by 1 200 m，the construction cost has decreased by 276 000 yuan，the average gas extraction concentration has increased to 85.7%，the average gas extraction purity has increased to 0.177 5 m3 /min，the drilling hole formation rate has increased to 94.8%，and the gas extraction radius has expanded to 5 m. Very good improvement effects have been achieved.

Key words: fully mechanized mining face, gas extraction, hydraulic cavitation