Abstract: During withdrawing period of inflammable thick seam fully mechanized caving face, the danger of spontaneous combustion in small coal mine goaf and failure zone is one of the main factors impact supports removing, the selection of ventilation methods are directly affect the safty and speed. After years of experimental research of Honghui No.1 Coal Mine, through the prethreatment of fire prevention for working face withdrawing tunnel, positive pressure ventilation technology combined with fire prevention of conventional grouting, nitrogen injection and other measures, which is effective to eliminate fire hazards and ensure the working face safe withdraw.