The distribution of fracture gas in the floor rock of the mining face of Longtan Mine was analyzed, the drilling and gas drainage holes were designed, and the drilling was arranged directly in the fissure gas area, with active drainage. The method of bottom wall fissure gas was to control the gas in the goaf before the working face was recovered, which fundamentally solved the gas emission problem and made the gas pressure of the crack in the mining roadway floor fall below 10 kPa in the recovery mining process. The wind gas concentration was controlled below 1.0%, which ensured the safe production of the mine.