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Effect of inclusions spatial distributions on the permeability and permittivity of composites is studied using the generalized Maxwell-Garnett equations.The result indicates that inclusions orientation distribution can increase the longitudinal electromagnetic parameters.For inclusions random and orientation distribution,single and three-layer absorbers are designed and optimized using genetic algorithm.The result shows that under a given absorbing requirement,absorber with inclusions orientation distribution is lighter and thinner than absorber with inclusions random distribution.