Abstract: A mixed hydrodynamic lubrication model of bearing with local wear was established based on the ave-raged Ｒeynolds equation and JFO cavitation boundary condition，in order to analyze the effects of local wear and cavitation effect on the mixed lubrication performance of journal bearing． The effect of different maximum wear depths on oil film thickness distribution，average hydrodynamic pressure distribution，position of axial center and Stribeck curves of the bearing were investigated by numerical solution． The results show that local wear significantly changes oil film thickness distribution and average hydrodynamic pressure distribution． The large wear depths lead to the change of the position of axial center，which deviates from the original design． The small wear depths reduce the friction coefficient of the bearing in mixed-lubrication regime，and can transfer from mixed-lubrication to hydro-dynamic lubrication at a lower speed． The friction coefficient increases with the increase of the wear depth．

Key words: journal bearings, mixed-lubrication, wear, JFO boundary condition