Abstract: The fully mechanized mining face adopts the mining method of full height at one time，and there exists the problem of oxidation and ignition of waste coal in goaf during the mining process.Traces of in order to fully understand the working face goaf ignition characteristics of coal oxidation，ensure the stope safety，by the method of measuring point goaf putting on the determination of the goaf gas composition analysis，concluded that the gas sample parameters of fully mechanized working face，and，in turn，determine the scope of the oxidation "three zones" of minedout area，the insitu observation method is simple and easy to implement，can be accurately classified mining goaf spontaneous combustion in the process of three zones，in order to prevent goaf coal oxidation problem to provide the theoretical basis.

Key words: Fully mechanized mining face,Minedout area,Oxidation "three zones"