Domestic dolomite sorbents for the SO₂ removal were prepared and the characteristics of sorbents were investigated by TGA, XRD, SEM and BET. To improve SO₂ capture capacity, the dolomite sorbents were calcined, hydrated and recalcined at various conditions. The specific surface area of hydrated sorbents increased with increasing stirring rate, hydration temperature and hydration time. In this work, the hydration process by using ultrasonic wave was conducted at the hydration temperature of 100 ℃ for the hydration time of 100-120 min. The specific surface area of sorbent hydrated at the above condition, was increased by 25%, compared to that of unhydrated sorbent and the hydrated sorbent exhibited SO₂ removal capacity of 16 times higher than unhydrated sorbent. The effect of particle size for the sulfidation was examined. As a result, the highest SO₂ removal capacity could be achieved at the particle size of 32-60 μm. The SO₂ removal capacity of sorbent below 32 μm decreased due to sintering at about 850 ℃.