The wear-resisting function of the 4-10mm thickness Ultra high molecular weight polyethylene artificially acetabulum was researched, which matches up with the 28mm-diameter artificial thigh bone. The Elastic deformation theory and the finite-element analysis to get the regularity of distribution on contract stress were compared, calculate the stress integral to friction journey during the normal gait, and according with the Archard wear calculation formula, compare the reckoning of artificially acetabulum in different thickness. By this calculation, the regularity of distribution for contact stress, which got from elastic deformation theory, is close to the result got from finite-element analysis. For a 65 kg sufferer matched with a 28mm-diameter artificial thigh bone, the wear-resisting of a 6-8mm artificially acetabulum is better, when the inner spherical radius is a little bigger than artificially acetabulum. Also, except the high –usage of stuff, it can prove the best balance performance and provide theoretical foundation to the optimum design of artificial acetabulum.