Based on massconservative boundary condition and Greenwood/Tripp asperity contact theory,the thermoelastichydrodynamic mixed lubrication model of dynamically loaded journal bearings was built,which can predict the oil film,cavitations and contact simultaneously.Results show that,when considering the thermal effect, the deformation of the shell and the asperity contact are increased,the minimum oil film thickness is decreased and friction power loss is increased.Transient and local temperature of the oil film rises rapidly,especially for the bearing side.Increased input/output oil flows after considering the thermal effect implies that the bearing has certain selfadaptability to the temperature.The research result show that it is most important to consider the effect of both the temperature and the contact with massconservative boundary condition during the design of critical dynamicallyloaded journal bearings.