Abstract: Firstly, fretting stress concentration failure fashion and contact wear failure fashion are distinguished. After obtaining the equation of fretting stress concentration factor (Kt), which is based on a simple calculation model of surfaces contact established in this paper, the formula which can be used to .predicate fietting fatigue life of thin plane specimen is derived by applying the "local stress-strain method". The derivation is then checked with! some test results in the literature. Finally, the fretting fatigue life predication results for a few of materials are given.