Abstract: Aiming at the problem of spontaneous combustion of residual coal in goaf during the withdrawal of thick seam layered mining face in Fengshuigou Coal Mine, the suspected high-temperature hidden danger area is preliminarily defined through the analysis of residual coal distribution, air leakage law and gas state in goaf; the fan-shaped fire detection hole is constructed in the closed external drilling field of the transportation roadway, and the “three-determination” principle of fixed person, fixed point and fixed time is adopted for gas sampling and analysis, so as to further accurately locate the natural ignition area in the goaf. After that, comprehensive fire prevention and extinguishing technical measures such as drilling injection of liquid CO₂ and yellow mud, grouting and plugging at upper and lower closed ends, buried pipe injection of nitrogen and liquid CO₂ in goaf were taken, so that the O₂ volume fraction in the closed area decreased to 5% and remained below 2% for a long time, so as to eliminate the hidden danger of high temperature and ensure the safe unsealing and withdrawal of the working face.