The application practice of gas control technology in Linxi Mine 1021-2 face was introduced. On the basis of adjusting and optimizing the ventilation system and increasing the air volume, the gas control effect was actually observed, analyzed and tested by adopting the technology of tailrace discharge, upper corner buried pipe and "2+1" high level drilling alternate joint pumping, and a comprehensive gas control technology suitable for Linxi Mine under the conditions of No. 12 coal seam was found, with good effect.