This micro stirling engine has been developed as light for hot spring heat using a source of heat of the biomass incinerator to supply the hot spring heat with warm water installed in a hiking course in village-vicinity mountain. This report is compared and examined with the engine performance and a simulation for the purpose of durability increase of an micro stirling engine. As the result, The brake power by this engine is about 0.6 W/2800 rpm. And The biggest engine speed improves this airpot engine compared with an old engine. And This airpot engine improves the durability big compared with an old engine. Brake power was calculated using a simulation, the high price was obtained about 60 %.