Abstract: In order to solve seam spontaneous combustion and gas over limit problems of a gas abnormal region of a spontaneous combustion seam in sealed goa f, based on the sealed goaf of No. 2311 coal mining face in Geting Mine as a study object, the monitoring and measuring analysis on the gas composition in the goaf, s urface atmospheric pressure variation, air leakage channel and others showed that the major factor of the gas fluctuation in the goaf would be the surface atmospheric pressure variation. Taking 103. 2 kPa as a boundary point, a high or low surface atmospheric pressure both would cause breathing phenomenon in the goaf. Based on t he circumstances, nitrogen gas replacement method was provided to control the gas in the goaf. A sealed wall integrated air leakage sealing technology. Meanuhile, the injected nitrogen gas replaced gas drainage technology were conducted. The results showed that with the measures implemented, the harmful gas drainage from the go af could be realized, thus the harmful gas in the goaf threatened to the mine safety production was solved. Meanwhile, the inerting conduction of the goaf could be kept, and no spontaneous combustion of the seam occurred.