This paper studied the micro motion of bolt joint under cycle load, introduced a distribution parameter model, considering that the function of pressure distribution of bolt joint is a curved face integral, and the relationship between energy dissipation and magnitude of loading was idetified. Then ABAQUS simulation results were compared to the experimental ones in order to verify the correctness of this model.At last they were applied to parameter identification of the Iwan model, makeing a foundation for further study of other type interface’s model building and parameter identification.