Propeller gravity will cause ship propulsion shafting deflection,resulting in poor lubrication on the edge of stern bearing.A magnetic-water hydraulic supported stern bearing was adopted,which can improve the adverse effect of propeller weight on the edge lubrication state of stern bearing by introducing the magnetic force of permanent magnet.The analysis method of three-dimensional magnetic characteristics of permanent magnet was constructed,and the influence of magnetic properties and shape characteristics of permanent magnet on magnetic bearing performance was explored.Based on the analysis method of elastic hydrodynamic lubrication of stern bearing,the influence of permanent magnet magnetic properties and shape characteristics on lubrication characteristics was obtained.The results show that the magnetic bearing capacity is obviously affected by the remanence of the permanent magnet material.The larger the remanence of the material,the greater the bearing capacity of the permanent magnet,and the better the lubrication state of the bearing.Increasing the number of permanent magnets along the circumferential direction or increasing the axial length of permanent magnets can increase the bearing capacity of permanent magnets,but the bearing efficiency of permanent magnets may decrease,which should be considered comprehensively in design.The arrangement of the magnet also has a significant effect on the magnetic bearing performance and lubrication performance.In the case of the same volume of the permanent magnet,a more reasonable arrangement can significantly increase the bearing capacity of the permanent magnet and the minimum water film thickness of the stern bearing.