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Physical meaning of representation methods for dielectric properties of dielectrics is investigated in this paper.It is found that pseudo relaxation is introduced by direct current conductance in modulus and impendence spectroscopy.A method to separate direct current transportation process and dielectric relaxation process by modulus spectroscopy is proposed.By combination use of dielectric spectroscopy,admittance spectroscopy and modulus spectroscopy,direct current properties and dielectric relaxation properties can be obtained at the same time without any uncertainty.