Abstract：In oredr to study the reason that was caused water inrushing and H2 S escaping when Ningtiaota coal mine central transport roadway heading to 112 m,based on the analysis of coal quality,geological structure and hydrogeological condition,the H2 S origin of anomaly is discussed. The research shows that it is mainly formed by the spontaneous combustion of coal seam,the effect of microbial sulfate reduction and the groundwater flow and pressure eventually lead to H2 S escape.

Keyword：H2S gas;influence factor;cause analysis;Ningtiaota coal mine;