The　technology　of　strengthening　RC　structures　using　prestressed　aramid　fiber　reinforced　polymer　(AFRP)　sheets　with　permanent　anchors　was　studied.　A　construction　method　was　provided　for　strengthening　RC　flexural　members　by　using　prestressed　AFRP　sheets　with　permanent　anchors.　The　experiments　were　carried　out　to　study　the　stress　relaxation　of　the　prestressed　AFRP　sheets,　the　flexural　and　shear　as　well　as　fatigue　behavior　of　RC　beams　strengthened　with　prestressed　AFRP　sheets,　and　the　effect　of　temperatures　on　the　mechanical　properties　of　the　adhesives　of　AFRP　sheets.　The　experimental　results　indicate　that,　comparing　with　the　non-strengthened　control　beam,　the　most　increase　was　in　the　initial　cracking　load　of　the　beam　strengthened　with　prestressed　AFRP　sheets,　and　the　yield　load,　the　ultimate　load　as　well　as　the　fatigue　life　were　also　significantly　increased.　After　concrete　cracking,　the　flexural　stiffness　of　the　prestressed　strengthened　beam　was　higher　than　that　of　the　non-strengthened　control　beam.　When　the　temperature　was　lower　than　60°C,　the　adhesive　strength　between　adhesives　for　AFRP　sheets　and　concrete　exhibited　no　softening.