Lead-Bismuth bearing is the significant part of the main loop system of the two-circuit of the new generation nuclear power plant,which is applied to prop up the entire shaft system.Considering the dynamic characteristics and lubrication mechanism is not clear,the hydrodynamic model of lead bismuth bearing was established and the influences of clearance,rotatory velocity,eccentricity ratio and annular groove on hydrodynamic characteristics of liquid film of lead bismuth bearing were investigated.The relationship between peak pressure and rotating speed,eccentricity and clearance was revealed,and the influence of clearance on the formation law of dynamic pressure effect was explored.The results show that the influence of the annular guiding groove on the load-bearing capacity and the dimensionless coefficient of friction is much less than that of without annular guiding groove.In addition,the maximum pressure is positive correlation with rotation speed and eccentricity ratio,and is negative correlation with clearance.Besides that,the minimum pressure is opposite to the maximum pressure.The research results provide firm theoretical basis for the design,development and localization of novel high-temperature liquid metal lubricated bearings.