In this paper, ABO3-type perovskite LaFeO3 nanosized photocatalysts were synthesized by a sol-gel method, using citric acid (HOOCCH2C(OH)(COOH)CH2COOH) as complexing reagent and La(NO3)3 6H2O and Fe (NO3)3 9H2O as raw materials. The asprepared samples also were characterized by several testing techniques, such as thermogravimetry-differential thermal analysis (TG-DTA), X-ray powder diffraction (XRD), Brunauer-Emmett-Teller (BET), infrared spectrum (IR), ultraviolet-visible diffuse reflection spectrum (UV-vis DRS), photoluminescence spectrum (PL), surface photovoltage spectroscopy (SPS) and electrical field induced surface photovoltage spectroscopy (EFISPS). The sample activity of different LaFeO3 nanoparticles for degrading Rhodamine B solution under visible irradiation (λ>400nm) was evaluated. The effects of thermal treatment temperature on photoinduced charge property and hotocatalytic activity were mainly investigated, together with their relationships. The results show that the LaFeO3 sample calcined at 500 8C exhibits higher activity, and the activity decreases with increasing calcination temperature, which is in good agreement with the characterization results. The weaker is the PL and SPS signal, the higher is the photocatalytic activity. Moreover, the activity of all as-prepared LaFeO3 samples is higher than that of international P-25 TiO2 under visible irradiation.