In order to improve the load carrying capacity and stiffness of the aerostatic bearings of the radial inflow turbogenerator for the organic Rankine cycle (ORC) system,the aerostatic bearings with R245fa as the lubricating medium was designed by gauge pressure ratio method,and the effects of rotor eccentricity,orifice size and inlet pressure on the load carrying capacity and stiffness of the aerostatic bearings were analyzed.The results show that the bearing load capacity and stiffness increase with the increase of speeds under the same air supply pressures.At the same speed,the load capacity and stiffness of the bearing at the air supply pressure of 0.7 MPa is slightly higher than those at other air supply pressures.The greater the eccentricity of the aerostatic bearings,the greater the load carrying capacity.The load carrying capacity and stiffness of the aerostatic bearings increases with the increase of rotational speeds under the same air supply hole diameter.The larger the air supply hole diameters,the greater the bearing capacity and stiffness of the aerostatic bearings.