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A Scattering-Parameters {S-Parameters) based macromodel of distributed-lumped networks is presented. The networb can include capacitive cutsets, inductive loops, RLC meshes, and lossy transmission lines. An ef)cienl network reduction algorithm is &veloped to reduce [he original nelwork into a network containing one multipor[ component together with the sources and loads of interest. The S-Parameters of the circuit components are approximated by Taylor series to simpllfi the reduction process. Exponentially Decayed Polynomial Function (EDPF) approximation is used to derive the macromodel, the higher accuracy can be obtained by selecting titrte constant according to an error cri[erion. The ntacrontodel is always stable for a stabte sys[em and very jkxible that the accuracy of the model can be controlled by adjusting [he order of approximation. The experimental results indicate that our model can approach the accuracy of SPICE with one or two order less computing time.