With the standard involute spur gear as the study object,the meshing area of the gears was discretized by using a numerical method,the calculate model of the wear of tooth profile was established based on the Archard wear equation,and the relevant calculation program was compiled.The relationship between the pressure angle and sliding coefficient,wear rate,friction distance and wear loss was analyzed,and the curve fitting was carried out.The results show that the variation law of the relative sliding coefficient,friction distance,wear rate and wear amount of the tooth profile in the meshing area are reduced first and then increased from the tooth root to the tooth top,and the theoretical value is zero at the node.This numerical calculation method can realize the quantitative calculation of wear rate and wear amount of the gear pairs with different sizes,different materials and at different conditions,so as to achieve the prediction of the service life of the gears.