Abstract: The study of flue gas desulfurization by contained liquid membrane had been carried out. The solution of citrate, sulfite and bisulfite was used as membrane liquid respectively.The influences of membrane pore size, membrane thickness, feed gas velocity, the concentrations of membrane liquid and feed gas on permeation flux of sulfur dioxide had been observed. It was found that the permeation flux of sulfur dioxide can be greatly enhanced by the use of optimum kind of membrane solution and liquid concentration.