In this research we prepared ZnS thin films by Spray pyrolysis method with thickness(300nm) on a glass substrates and study its structural and optical properties . The result of (X-Ray ) diffraction showed that the films have a polycrystalline structure , The Absorption and The transmission as a function of Photon Energy for ZnS films had
been studied , The investigated of energy gap of the direct allowed transitions of ZnS film showed a value of (3.53eV). The optical Absorption coefficient , extinction coefficient , and have been also study Refractive Index, as a function of Photon Energy.