In order to improve the gas extraction rate, based on the design of the Boli Mine mining project, combined with the mining of No. 15 coal seam, the characteristics of the mining methods, the occurrence of the gas,the source of the gas and the emission amount were analyzed, which got the conclusion that coal drainage method of No. 15 coal seam, with the adjacent layer and the mined area gas extraction, so that the mine mine gas resources can be fully extracted and used.