Abstract: Precise calculation of the deformation and load for automotive water pump bearing is very important for researching the life, lubricating property and dynamic behavior of the bearing, but it is always a difficult problem for the bearing industry. The traditional method for calculating the loads acting on the two rolling element rows of the automotive water pump bearing treats all the elements of bearing as rigid bodies and neglects the deflection and bending of the bearing spindle. Thus, the calculated results by this method are not precise enough. In this paper, taking the WR-type automotive water pump bearing as the research subject, an analytical model, from which the deformation and internal load distribution of the automotive water pump bearing can be obtained, was developed. Based on the internal elastic deformation of the bearing, the model for calculating the loads acting on the two rolling element rows of the auto water pump bearing was proposed. Finally, a calculation example was provided and the comparison was made between the results obtained by the new method and the traditional method.