The elastohydrodynamic lubrication geometric model of waterlubricated hybrid journal bearings was established.The numerical simulation of the bearings was carried out by using the Reynolds equation with thermal effect.The different limit values of velocity and load when the local maximum temperature of the lubricant reaches a critical value were calculated.The influence of the different types of lubricants,bearing materials and water supply pressure on the critical temperature curves which show the limit values of velocity and load was analyzed.The critical temperature curves of velocity versus load and their fitting function were obtained when the local maximum temperature of the lubricants reaches the critical temperature.The results show that the critical temperature curve of seawater lubricant is higher than that of purewater lubricant,and the critical temperature curve of plastic bearing is higher than that of ceramic bearing.The influences of water supply pressure on the trend of critical temperature curve of different bearing materials,as well as the range of critical temperature curve of different lubricants are different