Abstract: A new rheology model was established by simulating the liquid molecules with a rod-ball configuration. This model was derived by analyzing the process of the contact, passing and recovery of the rod-balls between two adjacent liquid layers. The new model is somehow similar to the Carreau model, however, it was strictly derived theoretically, and possesses only two rheological parameters, which can be determined by fitting the generalized viscosity curves given by the Carreau model. Moreover, using the new formula to the point contact thermal elastohydrodynamic lubrication problem, the rheological property of the high viscosity polymer PAO 650 was simulated, and a comparison was made with the experimental results published in the literature. Good agreement shows clearly the correctness of the new model, indicating that the new model is able to predict the rheological features of the high viscosity lubricant accurately. Its extensive applicability is further confirmed from the rheology curves under a variety of operating conditions.