A mathematical model was built for analyzing wear volumes of pin and disk.After a specific load on a pin,the diameter of the pin,the rotation speed of the disk and the working time have been given,the wear rates of the pin and disk were calculated.The numerical analysis result shows that during wearing process,the pressure between the interface of the pin and disk is decreased with the increasing of rotation radius,but it has a rebound near the maximum radius.For the pin,the wear rate of each point on the contact surface is related to the rotating radius,which is decreased with increasing of the radius and then raises up back to the height close to the initial one.For the disk,the wear rate is connected with rotation radius as well,but it acts just in an opposite way that the pin does:The worn surface of the pin is like an arch pointing outside.However,the profile of wear track of the disk looks like a letter U pointing inside.