In　order　to　improve　the　desulfurized　capacity　of　the　system　from　flue　gas　by　using　activated　carbon,　a　series　of　experiments　were　made　to　compare　the　differences　of　performance　between　using　activated　carbon　fiber　(ACF)　and　using　granular-activated　carbon　(GAC).　Experiments　show　that　under　the　same　working　conditions　the　adsorption　factor　of　ACF　is　16.6　times　as　high　as　that　of　GAC,　the　adsorbent　loss　ratio　of　ACF　is　1/14　of　that　of　GAC,　and　the　desorption　efficiency　can　reach　99.8%.　Conclusions　were　drawn　that　compared　with　the　traditional　methods　of　desulfurization　from　flue　gas,　the　use　of　ACF　can　greatly　economize　adsorbent,　obviously　reduce　the　frequency　of　adding　new　adsorbent　and　reduce　the　equipment　investment　and　operating　cost.　Therefore,　the　new　method　has　obvious　advantages　in　aspect　of　reliability　and　durability　in　system　operation.