Abstract: A mine belongs to Hancheng mining area, one of the mining areas with serious gas disasters in China.The fourth mining area is located to the north of the current main mining area and the third mining area, and it is the successor mining area of the third mining area.It conforms to the law of gas occurrence: “low southeast and high northwest”,with high gas concentration and pressure.Comprehensive mine desorption gas quantity W_j and gas pre-pumping anti-outburst index are adopted to determine the standard gas content W_D;Then, continuous and periodic observations were made on relevant extraction parameters such as extraction flow rate, negative pressure and gas concentration at the measurement hole in the study area.Finally, the variation diagram of extraction pure quantity over time was drawn according to the gas extraction data, and the negative index formula of extraction attenuation was obtained by fitting.Then, combined with the target gas content, the extraction time t needed to reach the expected extraction radius R in the inspection section is calculated, which lays a certain theoretical foundation for gas disaster control in the mine.