Abstract: ZLa-BiVO₄ photocatalyst was prepared by chemical precipitation method, and its photocatalytic reduction of CO₂ in water was examined. The catalyst was characterized by TG-DTA, DRS and XRD technology, and the effect of roasting temperature and other conditions on the activity of photocatalytic reduction of CO₂ were studied. The results showed that monoclinic phase La-BiVO₄ calcined at 800 ℃ has the highest activity. When the amount of catalyst was 0.8 g/L, reaction time was 8 h, CO₂ flow was 250 mL/min, the reaction temperature was 70 ℃, and the concentration of NaOH and Na₂SO₃ were both 0.10 mol/L, yield of methanol reached 290.18 μmol/g.