Using numerical simulation method, the effects of elliptical ratio and oil viscosity on the thermal elastohydrodynamic lubrication of a free fall motion were analyzed. The results show that a lower oil viscosity extends the impact rebounce time, the peak of the central pressure curve is reduced together with a shorter spike. Correspondingly the central film thickness and temperature rise are lowered. With the increase of the elliptical ratio, the impact rebounce time is shortened and the spike of the central pressure curve merges into its peak. The central film thickness is increased before it drops again. The minimum film thickness gains its value all the way. The reduced central temperature spike merges into its peak.