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The electrophysical properties of highly disperse aluminum oxide chemically modified with copper iodide have been studied in the superfrequency range and at low-frequencies in the temperature range 25-170 °C and the volume concentration from 0 to 0.25. The optimum volume content has been found of copper iodide (∼0.42) in the composites CuI/Al2O3, when the interfacial interaction is the most intensiv and the maximum values of electrical parameters take place. It has been shown that the polymer composites containing CuI/Al2O3 have higher values of the real and image parts of complex dielectric permittivity and conductivity as compared with a system without modified components. [ABSTRACT FROM AUTHOR]