The theoretical prediction results of the lubrication characteristics of the floating ring bearing show significant discrepancies with test data at high speed condition.Aimed at this problem,the thermal fluid dynamic lubrication model considering the influence of thermal effect was established to investigate the lubrication performance of the floating ring bearing of a turbocharger.The simulation results of the thermal model are consistent with the test results,which verifies the rationality and feasibility of the thermal model.The effect on lubrication characteristics of floating ring bearing by the structure parameters of inner and outer film oil clearance,thickness and width of ring was studied.The results show that while other parameters remain the same,with the increasing of outer bearing clearance,the ring speed ratio and oil flow rate will increase,which will take away more heat and reduce the temperature rise.While with the increasing of inner bearing clearance,the ring speed ratio will decrease and the flow rate will increase,which will also reduce the temperature rise.The increasing of ring thickness will cause the decreasing of ring speed ratio,but it has little effect on the temperature rise.The larger outer bearing width will cause the decreasing of ring speed ratio and the increasing of temperature rise.