Abstract: Through analyzing the CO source, the unsealed conditions is determined, opening airtight by going back to the 1201 mining face, the emission work of a small amount of wind is carried out. Checking the concentration of harmful gases inside and outside the demolished airtight in 1201 transportation roadway, after according with the provisions of the statutes, continue to dismantle 1201 transportation roadway airtight until section can achieve pedestrians and about the extending wind tube, the ambulance brigade will extend to 1201 transportation roadway front of the pressure balancing ventilation facilities, connection of pressure ventilation and realization of pressure equalizing of the mining face.