Considering the importance of photo catalytic oxidation of organic pollutants by semiconductors using sunlight, in the present study, we prepared and studied CdS-TiO₂ nanocomposite. The commonly used photocatalyst TiO2 as such has the drawback that it uses only the UV portion of sunlight. The CdS-TiO₂ composite was prepared by a modified sol-gel method. The structure and optical properties were studied by means of XRD, TEM and UV-visible spectroscopy. The composite was tested for their photocatalytic efficiency by the time taken for the degradation of the dye methyl orange under illumination of by absorption spectroscopy of samples extracted at different time intervals. It is found that CdS-TiO₂ is more efficient as a photocatalyst than pure TiO₂.This is due to better absorption of light in the visible range.