Abstract: For the actual situations of shorter spontaneous firing period, complicated geological structure, big and small faults and their traction structures in S3012 face of Sanmushu Mine, spontaneous combustion risk is easily occurred during the period of passing through faults. In order to guarantee the safe mining of working face, through the analysis of risk factors of spontaneous combustion, spontaneous combustion early warning system is established; reducing air leakage in goaf, strengthening the drainage management of goaf, coal body solidification and sealing and filling, grouting and nitrogen injection and other comprehensive fire prevention technology measures, spontaneous combustion of coal seam is effectively suppressed during the period of passing through faults.