Abstract The dye stuff lost in the textile industry poses a major problem to wastewater sources. This paper reports an investigation into the effect of a number of operating factors on the removal of Allura Red AC from an aqueous solution through photocatalysis Advanced Oxidation Processes (AOPs) are effective processes in treating waters polluted by a variety of harmful pollutants. This paper discusses about effect of the number of factors on removal of Allura Red AC from an aqueous solution using a photcatalytic process. The photcatalyst used in this solution was WO3/TiO2. Optimal dose of the photocatalyst was 0.1gL -1, color concentration was 20mL-1, and pH was 7.0. Efficiency of the photocatalyst was tested by SEM methods. Post-treatment analysis by GC-MS studies showed intermediate compunds. Photocatalysis is an effective process in decoloration because of isochronous presence of some strong oxidants and their promoting effect through production of highly reactive active hydroxyl radicals (OH).