Abstract: Aiming at the spontaneous combustion characteristics of permo-carboniferous high gas close distance coal seams in Xishan mine area,this paper studied the rules and characteristics of gas products in the process of coal oxidation,analyzed and optimized the indicated gas of coal spontaneous combustion,systematically established comprehensive index system of spontaneous combustion prediction including absolute,relative volume and second derivation coefficient of hydrocarbon gas products,which is suited for Permo-Carboniferous coal seam.