The catalytic reactivity for the direct sulfur recovery from the produced SO₂ in the regeneration process to element sulfur with the slip-stream fuel gas of hot gas desulfurization process as reductant was studied. The catalyst for directly sulfur recovery process was used Ce_0.8Zr_0.2O₂, and the SO₂ conversion and the element sulfur yield were investigated with the change of a reaction conditions, such as the amount of H₂O(2-10 vol%), the reaction temperature(400-600 ℃) and the mole ratio of reactants([reductant]/[SO₂]=1.0-3.0). The SO₂ conversion and the element sulfur yield decreased by increasing the amount of H₂O in the slip-stream fuel gas using as reductant and increased by increasing the reaction temperature and the mole ratio of reactants. From TPR experiment result, reason that the SO₂ conversion and the element sulfur yield becomes low by H₂O was confirmed because that the water-gas shift reaction(CO + H₂O → CO₂ + H₂). Specially, the element sulfur yield was fallen due to that created hydrogen to the water-gas shift reaction is converted to H₂S reacting with element sulfur.