The double Reynolds boundary condition was introduced to analyze the lubrication characteristics of the water lubricated rubber bearings,the differences of the elastohydrodynamic lubrication characteristics of bearings under between the double Reynolds boundary condition (DRBC) and Reynolds boundary condition (RBC) were discussed on the algorithm of Negative pressure filling zero,such as water film pressure distribution,load carrying capacity and friction.The results show that the water film starting position under DRBC is ahead of that under RBC,therefore the water film area is expanded.The initial boundary is parabola shaped rather than straight.The water film pressure distributions in water film rupture zone under the two boundary conditions are basically similar.However,outside the rupture zone the water film pressure under DRBC is greater than that under RBC.Because the water film pressure in the starting zone and rupture zone partially counteracts,the load carrying capacity of the bearing has little different under DRBC and under RBC.The attitude angle and friction under DRBC are greater than those under RBC.