Regular concave surface profiles are adopted in many friction surfaces. But
up to now, this is seldom tutored by the theory of lubrication. To design
them, a model of the regular depth optimization was provided. To determine
the other size, two propositions are given. At same time, two main effect f
actors on lubrication were discussed in detail. A lubrication test for diff
erent regular concave surface profiles was performed on a pin and ring test
er. On the basis of theory analysis and experiment, a principle to design r
egular concave surface profiles is provided.