21111 working face was the eleventh fully mechanized working face of No. 11 mining area in Dongpang Mine, due to geological conditions factors of working face, the cut eye arrangement in the working face needed with mining 5 m, with working face corner in return airway and increasing gas, which affected the normal production of working face, through the gas control technology, effectively solved fully mechanized working face with mining upper corner gas overrun problem with measures, which ensured the safe recovery of the working face.