Abstract: In view of the problem of gas abnormal emission in working faces with high mine pressure, a study is conducted on the phenomenon of gas abnormal emission in Changzhi Xianquan Coal Industry. Through analyzing the pore distribution characteristics and gas adsorption characteristics of the coal body, it is found that the micropores with the smallest pore volume ratio provid the highest specific surface area in the coal samples from Changzhi Xianquan Coal Industry, while the mesopores with the largest pore volume ratio provid the fewest specific surface area. In addition, there are plenty of gap holes and corrosion holes in the coal samples, and the microscopic fissures are well developed, especially the development degree of shear fissures is better than that of tensile fissures. During the N3102 backfilling excavation period, aiming at the differences in gas emissions in different sections, gas source separation governance technology is proposed. After adopting this technology for governance, the gas emission quantity in the roadway is observed continuously, the results show that the absolute gas emission quantity has a significant decrease, below 7 m³/min in most of the time. The gas source separation governance technology plays a key role, and provides theoretical basis and technical support for gas governance in high mine pressure working faces.