Abstract: High coal mine methane emissions contaminate the environment seriously.To reduce these methane,use bioconversion method.Methane-oxidizing bacteria possess the most capacity of oxidizing methane in nature.Provide a brief introduction of China’s coal mine methane emissions and application status.Address the methane oxidation mechanism by methanotrophs.Adopting methanotrophs,the methane can be converted to methanol,poly-beta-hydroxybutyrate（PHB） and single-cell protein.Introduce the research and development of these conversion.