A novel FePO_4 photocatalyst was prepared via a facile hydrothermal-precipitation method. The properties of the photocatalyst were characterized by UV-visible diffuse reflectance spectrum etc. The results show that its absorption band edge is about 450 nm. Besides,there is a good response to visible light. It only took 100 min to completely degrade 100 mL of rhodamine B dyes(0. 1 mol / L)under visible light irradiation(λ≥420 nm),and by the photocatalytic activity of FePO_4 under irradiation of monochromatic...