A novel PVA/CuI nanocomposite polymer electrolyte layer synthesized via the reduction of CuCl2 by NaI in an aqueous PVA solution. The as-prepared films were characterized by X- ray diffraction, scanning electron microscope, as well as impedance spectroscopy. The obtained results indicated the formation of hexagonal CuI nano particles of≈ 55nm sizes embedded in the PVA matrix. In addition, the study of dielectric parameters and conductivity of PVA/CuI nanocomposite in wide range of temperature and frequency are given and ...