The effective practical photocatalyst was prepared by the ferric oxide and butyl titanate. Photocatalysis of the acid brilliant scarlet dyestuff wastewater was carried out by using TiO2-coated ferric oxide. The effects of some factors, such as dosage of catalyst, illumination time and initial concentration of the dyestuff wastewater, are discussed in this paper. The experimental results show that TiO2 film immobilized on ferric oxide has a very efficient catalytic activity and absorption capability. The removal rate reaches the highest under the condition of 04 g/L TiO2-coated ferric oxide catalyst, the photocatalysis reaction has higher decoloring rate in a shorter time, and the average decoloring rate can reach 95% after 1 hour's reaction.