The spacing of adjacent rolling elements in bearing are subject to the number of rolling elements,and malposition may be resulted from manufacture and assembly errors,such geometrical factors will influence the replenishment and formation of elastohydrodynamic lubrication (EHL) film of contact region.The effect of spacing and malposition of adjacent rollers on EHL film formation and replenishment of oil under given supply oils condition was investigated by using three-roller-integral-load support finite line contact optical EHL test rig.The result reveals,for lower viscosity oil,a larger spacing of the adjacent roller produces a higher film thickness at the roller end,but malposition has little effect on the film thickness.For a high viscosity oil,the spacing of adjacent roller has only an effect on the film thickness near the end of 0.25 mm,and has rarely any effect at location far away from the end of 1.05 mm; with the increase of malposition distance,the film thickness near the end of 0.25 mm increases first and then decreases,while the film thickness at position far away from the end of 1.05 mm becomes thicker.