A　experimental　study　of　flexural　performance　of　reinforced　concrete　beams　(RC)　using　prestressed　aramid　fiber　reinforced　plastic　(AFRP)　sheets　with　permanent　anchor　was　conducted.　The　number　of　AFRP　sheet　layers　on　beams　varied　from　1　to　3　and　the　prestress　level　varied　from　0.45　to　0.65.　Based　on　the　experimental　study　of　seven　beams,　the　beams　strengthened　with　prestressed　AFRP　sheets　were　compared　with　the　beams　strengthened　with　un-prestressed　AFRP　sheets　in　flexural　properties　of　cracking　moment,　yield　moment,　ulti-mate　moment　and　flexural　stiffness.　The　experimental　results　show　that,　compared　with　the　un-strengthened　control　beams,　the　flexural　performance　of　beams　strengthened　with　un-prestressed　AFRP　sheets　were　enhanced,　and　that　of　beams　strengthened　with　prestressed　AFRP　sheets　were　further　improved,　validating　the　efficiency　of　prestressed　AFRP　sheet　retrofit.©　2011　Tsinghua　University　Press,　Beijing　and　Springer-Verlag　Berlin　Heidelberg.