Abstract: Activated carbon was used as the research object,and the simulated flue gas with different concentrations of SO₂ was processed by microwave irradiation.Through varying microwave heating temperature,heating time,activated carbon quality,flue gas flow rate and SO₂ concentration,the factors influencing desulfurization efficiency of simulated flue gas with different SO₂ concentration by activated carbon combined with microwave had been investigated The results show that increasing the microwave temperature will increase the desulfurization efficiency.When the temperature is 800℃,the desulfurization efficiency will reach 72%.Prolonging the heating time will help to improve the desulfurization efficiency.When the heating time is 6 min,the desulfurization efficiency will reach 69%.Further prolonging heating time do not result in significant improvement in desulfurization.Increasing the quality of activated carbon is beneficial to the improvement of desulfurization efficiency.When the activated carbon used is 50 g,the desulfurization efficiency reaches a maximum of 76.45%.Increasing the flue gas flow rate will reduce the desulfurization efficiency of activated carbon,and the flue gas flow rate of 0.3 L achieves the maximum desulfurization efficiency of 81.05%.Increasing the SO₂ concentration will reduce the desulfurization efficiency.When the SO₂ concentration is 400×10^-6,the desulfurization efficiency is 84%.