Using the method of micromechanics theory and the finite element method , the problem of electromagnetic field of spherical core - shell type particle is studied and effective permittivity forecasting formula of this particle is induced ; the forecasting results is confirmed by the finite element method ; the effect of material parameter and geometry parameter on the effective permittivity is studied 利用微观力学方法和有限元方法，对核壳型球形颗粒夹杂的复合材料的电磁场问题进行了研究，得出了核壳型球形颗粒夹杂的复合材料的等效介电常数的预测公式，并用有限元方法进行了验证：研究了材料参数和几何参数对等效介电常数的影响。
