The theoretical equations representing the linear viscoelastic behavior of the spun bonded nonwoven fabrics were derived in terms of the mechanical properties of their constituent fibers and binders, and the orientation distribution functions. The linear 6 element viscoelastic model of the composite consisting of two 3 element models a fiber and a binder in series arrangement was applied for the characterization of the viscoelastic behavior of spun bonded nonwoven fabrics. Relaxation modulus and creep compliance of the spun bonded nonwoven fabrics predicted from the 6 element model showed a reasonable agreement with experimental results. The comparison of theoretical and experimental results of the dynamic modulus showed that the theoretical storage tensile elastic modulus more closely approached to the experimental value than the theoretical loss tensile elastic modulus.