The Pr 3+/TiO2 photocatalyst with different amounts of doped Pr 3+ and calcination temperatures are synthesized by sol-gel method and characterized by XRD, FT-IR and SEM. Basic fuchsin experiment is chosen to evaluate photocatalyst activity. The results show that the synthesized samples are anatase TiO2 with the Pr 3+ doped. While it has been found that rare earth interrupts the transformation from anatase to rutile. Photocatlytic experiment results show when the sample is calcined at 400 ℃, containing 0.2% Pr 3+ /TiO2 and 1 mL 30%H2O2, without lighting, and t=120 min,the degradation rate is 100%