Abstract: To solve the space and time limitations of artificial spontaneous combustion “three belts” measuring points, the dynamic and automatic analysis of spontaneous combustion “three belts” is realized by relying on KJ428 mine distributed laser fire monitoring system, beam tube maintenance technology, measuring point location marking technology and “three belts” visual curve drawing technology. The range of non-spontaneous combustion zone, spontaneous combustion zone and suffocation zone on the return air side of the goaf in 31202 obtained by using this technology is respectively: 0-60 m behind the mining face, 60-130 m behind the mining face and 130 m behind the mining face to the deep part of the goaf, which is basically consistent with the artificial measurement results.