Water-lubricated rubber alloy bearings make use of new engineering complex material to replace precious metal as frictional pairs,natural water to replace mineral oil as lubricant.They realize energy.conservation and environmental-friendly and can be widely applied in many engineering field such as shipping,machinery,petroleum industry,cbemical industry,water conservancy,agriculture mining,etc.The paper alms at the problem that the existing longitudinal grooves make accurate calculation of elastohydrodynamic lubrication (EHL) complex,high elasticity and low elastic modulus (compared to metal) of rubber alloy make elastic deformation compared to water film thickness cant be ignored.Introducing calculation method of EHL theory,the numerical analysis of lubrication mechanism of water-lubricated robber alloy bearings is carried out by using multi-grid method.Curves of dimensionless film thickness and dimeusionless pressure are drawn.The results indicate that on the dimensionless pressure curve second pressure peak doesnt exist and on the dimensionless film thickness curve the minimum film thickness appears on symmetrical axis without “earlobe”.The water film shapes wedge.It is good for forming of EHL and friction.wear property is enhanced.The study offers theoretical basis for series product development and engineering application of water-lubricated robber alloy bearings.