The catalytic reduction of SO₂ to elemental sulfur by CO over CeZrO₂ was studied in this work. The CeZrO₂ catalysts were prepared with a change in Ce/Zr mole ratio (Ce_1-xZr_xO₂, x=1, 0.8, 0.5, 0.2, 0). We investigated reactivity of Ce_1-xZr_xO₂ in accordance with experimental conditions, such as reaction temperature, space velocity (GHSV). The Ce_0.8Zr_0.2O₂ and Ce_0.5Zr_0.5O₂ catalysts showed the SO₂ conversion of 93% and elemental sulfur selectivity of 98% at temperature above 425 ℃, superior reactivity than other catalysts. The cerium based catalysts with zirconium were improved oxygen mobility and degree of reduction Ce⁴⁺. It is important to control mole ratio between Ce and Zr because of the surpassing oxygen mobility and degree of reduction Ce⁴⁺.