The effect of high slideroll ratio (2.0≤S≤∞) on thermal elastohydrodynamic lubrication (EHL) in line contact was explored numerically. The deformation of the surface waviness with different slideroll ratio was analyzed. The values of the surface velocity and the applied load were also altered to see the effect. The results show that, under a high slideroll ratio, the deformation of the surface waviness is decreased with the increase of the slideroll ratio. The dimple depth and pressure peak are increased with the reduction of the surface velocity while the thermal rise is also increased with the increase of the surface velocity.