Photocataltic reduction of carbon dioxide into fossil fuel or hydrocarbon-containing material in presence of sunlight. In this study synthesis of photocatalyst with a higher photosynthesis activity by using hydrothermal method. Synthesis of W doped titanium dioxide powder is nanocrystalline state and microstructure obtained. Structural characterization of this W doped titanium dioxide powder photocatalyst specify tungsten was strongly doped into the titanium dioxide and structural pattern investigated by field emission scanning electron microscopy (FE-SEM), energy dispersive X-Ray anlysis and X-Ray diffraction. The study of photocatalytic CO2 reduction was show that w doped titanium dioxide could higherly active photoresponce of TiO2. Formic acid and formaldehyde were identified as photo product and were measured spectrophotometrically using CTA (cromotropic acid). The effect of the variation parameter such conc. of carbon dioxide, amount of photocatalyst, light intencity and pH on the yield of photocatalyst photoproduct was also investigated.