Abstract: The S₁1201 working face is the first mining face of the second mining level in Dalong Coal Mine. The distance from S₁1201 to its protected coal seam, No.13 coal seam, is 11.17 m on average. Through analyzing the sources of gas emission, and adopting reasonable ventilation, and source-division three-dimensional extraction gas control technology, during the mining period of the S₁1201 working face, the returned air is 1 000 m³/min, gas extraction quantity is 33.2 m³/min, and gas drainage rate goes up to 86.7%. This article also analyzes the problems existing during the gas control and treatment process, and puts forward the corresponding improvement schemes, which guarantees the safety production of working face.