Based on the scales theory of electromagnetic filed, the anisotropic medium is changed to beisotropic. The electric field intensity of a point charge and Coulomb′s law are obtained. Coulomb′s law states that the direction of the force between two point charges in the presence of anisotropic medium is not along the line connecting the charges. When the relative permittivity tensor increases, the off connection of the force increases. The motion of a charged particle in the presence of anisotropic medium is researched.