In order to solve the problem of air leakage and natural fire in the working area of 172107 working face in Dashucun Mine, the technology of confinement wall + MA mining inorganic composite foam material was adopted. The continuous observation after the confinement showed that the gas at the confinement wall was small and stable, and there were no harmful gases such as carbon monoxide and gas outside the confinement wall in the past month. The technology prevented the air leakage from the mining area, eliminated the spontaneous combustion in the mining area, and played a very good confinement effect.