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Multi-region time domain integral equation is developed to analyze the electromagnetic scattering from three dimensional combined conducting and dielectric objects. In this paper, we use EFIE-PMCHM to solve the time domain integral equations. The problem is formulated in terms of a set of coupled integral equations involving equivalent electric and magnetic surface currents based on equivalence theorem. The conducting structures and the dielectric materials are modeled by planar triangular patches, RWG basis and Galerkin method are used. Numerical results are given for various structures and compared with other available data. The numerical results show that the present method has satisfying accuracy.