Abstract: According to the problem that a large number of residual coal left in the goaf of the resources integration mine because of the early extensive mining, wh ich was easy to cause spontaneous combustion of coal. Taking No. 4 + 9 coal seam of Beizu Coal Mine as a study subject, the combustion situation of fire area was res earched through indicator gas experiment, and the high-temperature area of the roadway roof face was divided through infrared detection technique. The result showed that, CO、C2H4and C2H6could be taken as the indicator gas for spontaneous combustion in No.4 + 9 coal seam of Beizu Coal Mine, the temperature in fire area was 80 ~ 110。C，and there was a tendency that the fire area enlarged from north to south. The research result provided reference for drilling detection and plugging and so on.