Abstract: in order to study the nitogen inj ction affected to the division of the spontanecus combustion zone in the goaf based on the analysis on the index gas concentrations measured at the five measuring points in No. 3 seam goaf of Xing-un Mline,a division method of spontaneous combustion fve zones in the goaf under thecondtion of ntrogen injection was provided and they were the heat emission zone. the sponmtaneous combustion zone and sufocation zone ocured bytheinfuencs ofthe ntirogen injection.the spontaneous combustion zone and sffocation zone ocured afer therntfroge injecion completed.The study showed that the scope ofthe spontaneous combustion zone and sifcaion zone occured by the infuences of the nitrogen inj ction would have a migration occurred and would beoome a spontaneous combustion region.The paper proposed that the SPS corelation analysis of the idex gascould be apliedtojudge the goaf scope infuenced by the irogen in eotion.The resultshowed that in the nirogen injection procss the index gas around No.2 measuring point at the air income side was ighly relaed to the ntirogen ij cton volume.T he region highly infuenced by th ntragen inij ction was located near No. 1 and 5 measuring poimts at the air incomegatevay ofthegoaf .Thentrogen infection infuence was low and the correlation analysis of the nitrogen injection infuence region was the same to the site measurement