In this work, CuO thin films about the synthesis of the thin films are prepared on glass substrate using spray pyrolysis technique at room temperature different annealing times in temperature 450 0 C.In order to study the effect of annealing times onthe structural, optical and electrical properties.XRD analysis has shown that films with a polycrystalline structurehave a(Monoclinic) structure.In addition, the crystallite phase CuO increases with increasing of annealing temperature.Moreover, with a preferred orientation along (002) peak.The optical properties confirmed that the elaborated films have a transmittance of 70%. We have found that the band gap energy (Eg) is a decreasing function with respect to the annealing temperature time. In addition, the electrical resistivity varies from 18.97 to 4.58 KOhm.cm for the films grown at different annealing times.