The geometrical morphology and properties of the friction surface. When there is a lubricating oil film thin surface between related work, the work surface near the peak and valley repression will make two surface or divert the lubrication oil flow, this will affect the results of friction and oil film thickness. The two surface is close to both sides, peak occurred in contact or collision, friction and heat generated from this only thermal effect on oil, but also influence the boundary film formation and rupture. As for the contact with friction and wear processes running in, of course, is more related to the original surface morphology and surface topography. The surface morphology is very important for the study on the tribological problem, but it was not until twentieth Century 60 years before people realized gradually, to the late 70's before it and surface damage studies linking.