Abstract: Coalbed methane thermal storage type Stirling engine system based on porous medium burner is power utilization method which adapts to characteristics of low coal mine methane concentration and big flectuation in China.Through organically combining good adaptability of porous medium burner to low-concentration gas source with the external combustion characteristics of the Stirling engine,the device builds Stirling engine system drived by the porous medium burner,and the connection between the two devices is achieved by heat accumulator,which further alleviates the impact of coalbed methane gas source fluctuations on the system.