Abstract: Spontaneous combustion occurred at lower corner of 22061 stop mining face in Caohua Coal Mine. Smoke and air-leakage in gob and the CH₄ concentration increased in fire area. Explosion threated rescuers' safety. In the case of that the fire couldn't be put out directly, the technology of closing the fire zone and injecting nitrogen was taken. Spontaneous combustion accident fast and safly dealed with this.