A　study　was　carried　out　for　the　fatigue　behavior　of　corroded　RC　beams　strengthened　by　non-prestressed　aramid　fiber　reinforced　polymer　(AFRP)　sheets　and　prestressed　AFRP　sheets　with　permanent　anchors.　Based　on　the　fatigue　test　results,　the　effects　of　different　pre-stress　levels　of　AFRP　sheets　under　different　corrosion　ratios　(moderately　corroded:　reinforcement　mass　loss　6.　0%,　severely　corroded;　reinforcement　mass　loss　12%)　on　the　properties　of　the　fatigue　failure,　fatigue　life　and　mid-span　deflection　were　analyzed.　The　major　cause　of　the　fatigue　of　the　corroded　RC　beams　strengthened　with　AFRP　sheets　is　the　fatigue　fracture　of　the　steel　bars.　The　fatigue　life　of　the　beams　strengthened　with　prestressed　AFRP　sheets　was　longer　than　that　of　those　beams　with　non-prestressed　AFRP　sheets.　The　fatigue　life　of　the　moderately　corroded　RC　beams　increased　with　the　pre-stress　levels　of　AFRP　sheets,　and　the　fatigue　life　of　the　corroded　RC　beams　decrease　with　the　ratio　of　corrosion.　The　fatigue　results　were　compared　to　the　fatigue　data　of　smooth　bars　to　estimate　an　equivalent　fatigue　notch　factor　for　the　main　reinforcement　bars　of　the　tested　specimens.　Pitting　corrosion　resulted　in　an　increase　in　the　fatigue　notch　factor,　which　in　turn　resulted　in　a　significant　reduction　of　fatigue　life.　Based　on　the　experimental　results　of　moderate　corroded　concrete　beams　strengthened　with　AFRP　sheets,　the　fatigue　equation　was　obtained,　and　this　equation　can　be　used　in　strengthened　design　for　damaged　bridge.