Several bormo substituted copper phthalocyanine derivatives: monbromo tetraalkoxyl phthalocyanine copper, dibromo tetraalkoxyl phthalocyanine copper, tetrabromo tetraalkoxyl phthalocyanine copper and tetraalkoxyl phthalocyanine copper thin films were prepared on single crystal silicon substrates by spin coating respectively. The ellipsometric spectra of these films have been investigated by using an improved rotating analyser polarizer (RAP) type of scanning ellipsometer. The refractive indices and absorption coefficients of the films were given in the wavelength range 500 nm～800 nm. Effects of peripheral electron withdrawing bromine substitute on the optical properties of the thin films were studied as well.