Abstract: Adsorption removal of SO<SUB>2</SUB> in flue gases by ZSM-5 molecular sieve was experimentally investigated,and its basic dynamical characteristics,effects of amount-of-substance ratio of Si to Al （Si/Al）,temperature,and space velocity were further analyzed.Results showed that adsorption of SO<SUB>2</SUB> with ZSM-5 molecular sieve accorded with Langmuir equation,belonging to physical monolayer adsorption.With ZSM-5 molecular sieve of n（Si）/n（Al）=38,under the conditions that temperature of 25 ℃,space velocity about 700 h<SUP>-1</SUP>,and volume fraction of SO<SUB>2</SUB> in the inlet around 0.3%,the absorption time of saturation was 180 min,and the saturated adsorption capacity was 0.018 g/g.Under the conditions of lower temperature,smaller amount-of-substance ratio of Si to Al,and lower space velocity,adsorbing properties of ZSM-5 molecular sieve to SO<SUB>2</SUB> was better.