Abstract: A micromechanical model for single-fiber pull-out test of fiber-reinforced elastomer matrix composites is established. It includes fiber, matrix and viscoelastic interface. The formulas to calculate the axial stress of fiber, the shear stress of interface, and the axial and shear stress of matrix are obtained. Moreover, for Kevlar aramid fiber reinforced elastomer matrix composites, this paper studies the influences of the coated fiber length, the fiber volume fraction and the interface thickness on the stress distributions of fiber and interface. Some analysis results show that, with the increase of the embedded fiber length, the axial stress of fiber increases monotonically, but the shear stress of interface decreases following an increase at the beginning. The stress distributions of fiber and interface change with the variation of the coated fiber length, the fiber volume fraction and the interface thickness.