Abstract: In response to the problems of lack of standards for dividing the coal spontaneous combustion "three zones",and the unclear inerting areas of the goaf under different nitrogen injection conditions in the 1A223 working face of Buya Coal Mine in Xinjiang,a programmed temperature rising experiment is adopted,combined with theoretical analysis,numerical simulation,and on-site actual measurement methods,the range of changes in oxidation zones before and after nitrogen injection and the distribution characteristics laws of the coal spontaneous combustion "three zones" are analyzed.The results show that the critical oxygen concentration of the coal body is calculated to be 6.6% combined with the coal spontaneous combustion parameters,and the spontaneous combustion "three zones" in the goaf are accurately divided combined with the on-site actual measured oxygen concentration data.The oxidation zones are located at 14.5-25 m on the air inlet side and 6.6-33 m on the air return side.Under a nitrogen injection flow rate of 450 m3/h,the length of the oxidation zone on the air inlet side decreases by 82%,and that on the air return side decreases by 50%,effectively reducing the oxygen content,forming an inert atmosphere,limiting the supply of oxygen for coal spontaneous combustion,slowing down the development of residual coal spontaneous combustion,and significantly improving the safety of the mine.