Abstract: Adsorption and removal tests of SO₂ in simulated industrial flue gas were done with polyacrylonitrile activated carbon fiber (PAN-ACF) in the fluidized state: Some influencing factors such as the flux and temperature of flue gas, mass concentration of SO₂ and volume fraction of vapor in flue gas, recycle ratio of ACF, and mass flux of new ACF on the desulfuration efficiency of PAN-ACF were investigated. The results show that PAN-ACF has a better desulfurization performance. Its desulfuration efficiency decreases with increasing the flux and temperature of flue gas and the mass concentration of SO₂, increases first and decreases later with increasing the volume fraction of vapor in flue gas, and increases with increasing the recycle ratio of ACF and the mass flux of new ACF.