Aiming at the "hot spot" phenomenon in the traditional stirling machine heater tube, the porous medium heater of stirling machine was put forward to improve the average heat transfer temperature outside the heating tube. By improving the model of Newman and Baker 's attached jet, the porous medium model of stirling machine heater is proposed. The heat transfer characteristics of the porous media model are compared with the convective heat transfer characteristics under the Fu x. equation, and the heat transfer coefficient of the heating pipe under different flow rate and aperture is analyzed. It is proved that the porous media model has a good fitting characteristics for large pore size, uniform internal structure and smooth shape of the porous foam medium under the attaching effect.