Abstract: The permittivity of a composite with embedded conducting particles exhibits a large enhancement above the value by the Clausius-Mossotti and other dipole approximation. Recently a few people have developed an effective cluster model for the law, in which the effect on the shape of the conducting particles was described by using a factor u0. The insulator was treated only as a matrix. This paper is aimed to treat the metal and the insulator on an equal footing and improve the model as in paper 2. Finally a comparison was made with our permittivity measurement of the composites LDPE with embedded Cu and Al powders and the electron micrograph of the samples was examined, which shows that the theory is in excellent agreement with the experiments.