A　primary　study　on　fatigue　behaviors　of　strengthening　corroded　RC　beams　using　prestressed　aramid　fiber　reinforced　polymer　(AFRP)　sheets　with　permanent　anchor　was　carried　out.　The　objective　is　to　examine　the　effects　of　AFRP　composite　rehabilitation　systems　on　the　fatigue　performance　of　corroded　RC　beams.　Based　on　the　fatigue　experimental　results,　the　effects　of　different　pre-stress　level　of　AFRP　sheets　under　different　ratio　of　corrosion　(moderate　corroded:　reinforcement　mass　loss　is　6.0%,　severe　corroded:　reinforcement　mass　loss　is　12%)　on　the　properties　of　the　fatigue　failure,　fatigue　life,　mid-span　deflection　and　materials　strain　were　analyzed.　The　experimental　results　showed　that,　the　fatigue　failure　mechanism　of　the　corroded　RC　beams　strengthened　with　AFRP　sheets　is　the　fatigue　fracture　of　steel　bar.　Comparison　between　the　beams　strengthened　with　prestressed　AFRP　sheets　and　the　beams　with　non-prestressed　AFRP　sheets　was　made,　and　it　shows　that　the　fatigue　life　of　the　retrofit　RC　beams　increased　with　increase　of　the　pre-stress　level　of　AFRP　sheets　and　the　fatigue　life　of　the　corroded　RC　beams　decrease　with　increase　of　the　ratio　of　corrosion.　Pitting　corrosion　resulted　in　the　increase　in　the　fatigue　notch　factor,　and　this　increase　resulted　in　a　significant　reduction　in　the　fatigue　life.