Abstract: The WO₃/graphite phase carbon nitride (g-C₃N₄) composites were prepared by mixing self-made layered g-C₃N₄ with WO₃ nanoplates and afterward calcination process, and were characterized by XRD, SEM, TEM, UV-Vis DRS and PL. The results show that g-C₃N₄ presents graphene-like layered structure, and WO₃ indicates nanoplate structure, and scatters on the surfaces of g-C₃N₄. After compounding with WO₃, the absorption edge of UV-Vis spectrum shifts to red, which widens the response of g-C₃N₄ to visible light. The photocatalytic degradation properties of WO₃/g-C₃N₄ were examined using rodamine B (RhB) as a simulated pollutant. When the mass ratio of WO₃/g-C₃N₄ is 1∶5, the best photocatalytic activity is obtained. After 60 min of visible light irradiation, the degradation rate of RhB can reach 94.9%. The photocatalyst shows good stability, as the photodegradation rate of RhB reaches 88.9% after repeated use of the same photocatalyst for 6 times. The study of photocatalytic mechanism shows that superoxide radical (·O₂⁻) is the main active species for photocatalytic degradation of RhB.