A　jet　pump　used　in　the　thermoacoustic　engine　can　improve　the　performance　by　suppressing　the　Gedeon　streaming.　In　this　paper,　response　surface　methodology　(RSM)　and　desirability　approach　are　used　to　investigate　and　optimize　the　jet　pump　in　a　thermoacoustic　Stirling　heat　engine　(TASHE).　The　position,　length,　diameter　and　tapered　angle　of　jet　pump　are　selected　as　the　designing　parameters,　and　pressure　amplitude　and　time-averaged　power　dissipation　across　the　jet　pump　are　adopted　as　responses.　The　analysis　of　variance　(ANOVA)　is　conducted　to　identify　the　significant　influences　of　jet　pump＇s　parameters　on　responses.　The　regression　models　are　obtained,　and　prediction　deviations　for　pressure　amplitude　and　power　dissipation　are　within　+/-　2%　and　+/-　5%　respectively.　In　addition,　the　influences　of　jet　pump＇s　parameters　on　responses　are　plotted　by　3D　surface.　Eventually,　the　designing　parameters　of　jet　pump　are　optimized　to　achieve　both　maximal　pressure　amplitude　and　minimal　power　dissipation.　The　optimal　results　are　validated　by　comparing　with　DeltaEC　simulation.　Results　show　that　the　deviations　between　DeltaEC　and　RSM　for　pressure　amplitude　and　power　dissipation　are　1.86%　and　2.88%,　which　indicates　that　RSM　as　an　assessment　methodology　in　optimizing　jet　pump　is　feasible.　(C)　2017　Elsevier　Ltd.　All　rights　reserved.