On the basis of fluid lubrication,considering the effect of thermal effect on the oil film viscosity,the dynamic characteristics of the floating ring bearing of turbocharger were studied.Parameterized model of turbocharger floating ring bearing was established by the software DyRoBesBeperf,and the oil film pressure distribution,the variation of eccentricity,oil film stiffness and damping with speed were analyzed when the ring ratio is constant.The results show that when the floating ring bearing structure parameters and the load are certain,with the increasing of rotor speed,the eccentricity is decreased and the Sommerfeld number and power consumption are increased,while the Sommerfeld number and power consumption of the inner oil film are greater than that of the outer oil film,therefore,the bearing capacity of inner oil film is bigger than that of outside oil film.As the eccentricity is decreased with the increasing of rotating speed,the equivalent stiffness and equivalent damping of the oil film are decreased.