Abstract: An interfacial friction model has been presented to analysis the mechanical behavior of unidirectional fiber reinforced ceramic matrix composites. The matrix crack spacing was determined by means of the critical matrix strain energy criterion; the percentage of fractured fibers was determined via a unique Weibull failure distribution; the extent of interface wear has been estimated as a function of the relative displacement between fiber and matrix, τ_i=τ_i (Δδ). The stress-strain responses under quasi-static and cyclic loading obtained from the present analytical model are in a good agreement with their experimental counterparts. The interface slip distribution under a random load course has been discussed.