<p>The bearing wear coefficient is the key parameter for the prediction of bearing wear. This paper took the water-lubricated rubber bearing of the underwater vehicle shafting as the object, based on the improved Archad wear model and theoretical calculation method, carried out the analysis of the mechanical properties of the bearing liner and physical simulation test of the bearing and discussed the internal relationship between the wear coefficient and wear rate of the bearing, the influence law of contact pressure, rubber hardness, and other parameters on the wear coefficient, and presented the expression of wear coefficient of the bearing and verified by bearing bench test. The results show that the wear cross section of the bearing can be approximated as a crescent shape; the sinking amount of shaft increases with the increase of specific pressure; rubber hardness has a significant impact on rubber wear; the wear coefficient of the bearing is not the inherent property of the bearing rubber material, which is related to many factors such as wear amount, specific pressure, rotating speed, and elastic modulus and is not a constant.</p>