Abstract: Aimed at the fire district status of overlying 12 coal gob in 22305 working face of Bulianta Coal Mine, the impact was analyzed for 22305 working face affected by surrounding fire district. The heights of caving zone and fractured zone were calculated by analyzing the position relationship between 22305 working face and fire districts of overlying 12 coal gob. It was obtained that the open fire in the fire district of overlying 12 coal gob would not affect 22305 working face, but the toxic and harmful gas of overlying fire district could invade into 22305 working face and cause harm. The fracture appeared from ground would enlarge the spontaneous combustion danger of 22305 gob because of air supply oxidative. Therefore, the monitoring efforts must be increased, and the fire district of 12 coal gob area must be controlled continually.