Abstract: TheEu³⁺TiO₂  photocatalyst with different amount doped Eu³⁺and different calcination temperatures were synthesized  by sol-gel method, and the obtained photocatalyst were characterized by XRD and FT-TR. Rhodamine B was used as the target degradation of the optical activity of the prepared samples; also, the influence of cocatalyst on its photocatalytic performance was investigated. The results showed that rare earth doping of Eu³⁺ could grain the refinement, and when calcined at 500 ℃, TheEu³⁺TiO₂  molar ratio of 0.05% catalyst, added 5 mL cocatalyst, irradiated under tricolor energy 3 h, the degradation rate could be 91.8%.