Abstract: According to the spontaneous combustion status occurred in ZF42105 Coal Mining Face in Chaijiagou Mine, the fire zone sealing, constant pressure and nitrogen injection measures were firstly conducted and the coal spontaneous combustion in ZF42105 Coal Mining Face was effectively controlled.Based on the beam tu b monitoring and measuring data, the combustion status before and after the fire zone sealed were analyzed.A further glue injection fire distinguishing plan was conduct ed and the CO over limit of the coal mining face was effectively controlled.After the glue injection plan conducted, with the gas component ratio, there was no re-combu stion environment existed in the fire zone as judged and according to Mine Safety Regulations, the fire zone sealing was safely opened.