(CdCr2S4) thin film has grown on cleaned glass substrate at (673k) temperature using spray pyrolysis deposition technique of thickness (430nm) . UV-VIS. spectra of the film was studied by using the optical absorbance measurements which were taken in the spectral region from (300-1100)nm . Optical constants such as optical allowed and forbidden energy band gap of direct transition , absorption coefficient , extinctioncoefficient and refractive index were evaluated form these spectra. CdCr2S4has high value of absorption coefficient (α > 104cm-1) which conducive to increasing the probability of occurrence direct transitions .Optical allowed band energy for direct transition was (3.325eV) and the forbidden one was (2.61eV) .