A new solid amine was prepared as adsorbent of SO₂. For comprison, the adsorption efficiency of several kinds of solid amine adsorbents with different structure and pore size were investigated. In addition, the mechanism of SO₂ adsorption and the properties of the desorbing were discussed. The results show that the solid amines have a high SO₂ adsorption capacity. The residual amount remaining in the solid amine is measured to be low after 20 times of adsorption-desorption cycles. The desorption of SO₂ was significantly affected by the type of molecular sieve structure and pore size of the solid amines. The adsorption efficiency is decreased by reducing the pore size of molecular sieve. However, the residual of SO₂ was decreased with the increase of SiO₂/Al₂O₃ content in solid amine. The effects of CO₂ and NO_x on the solid amine SO₂ adsorption were also studied. The results showed that CO₂ had little effect on the adsorption of SO₂ in the solid amine, but the adsorption of SO₂ was interfered byNO_x. Investigation on the chemical composition of desorption residuals show that the components of desorption residuals of the solid amine adsorbent is similar to that of the liquid amine thermal stabilizers. Because of its high operating temperature, the solid amines could be easily regenerated.