As for line contact friction pairs, the surface morphology of non smooth structure unit has a certain effect on its wear resistance such as concave, convex hull, corrugated, scale morphology etc., and the diameter and depth of the concaves have a significant influence. Taking circular pit non smooth surface for an instance, analyzes the wear process of the different diameter and depth pits of non smooth surface and researches the influence degree of bionic non smooth surface on the wear resistance of friction pairs. The results indicate that in the linear friction pairs working process, the equivalent stress and friction on the friction pair surface increases with the increment of the diameter of circular pit and appears parabolic growth with the depth increasing at the conditions of pit spacing of 1 000 μm, and the wear resistance of rectangular piece is the optimal when the pit diameter is 100 μm and the depth is 300 μm。