Abstract: According to the Phoenix mine Y type ventilation gobside entry retaining mining without coal pillar, a large quantity of air leakage, the rules of air leakage complicated, and spontaneous combustion of coal.In order to prediction of coal spontaneous combustion earlily, the selfdesigned “coal spontaneous combustion characteristic test system” is adopted to so some related research.The research results show that the mark gas system is acquired,an achieve a goo effect. It is necessary to explain that, the gas system contain CO of the 15# spontaneous combustion of coal,which is the main ingredients of the gas system,and C2H4 and C2H2,which are the less content of the gas system comparing with the CO.

Key words: KeywordsSpontaneous combustion, Prediction, Mark gas system, Optimization