The　interface　bonding　properties　of　FRP-reinforced　concrete　under　wet/dry　conditions　are　studied　by　performing　the　interface　bond　test.　The　effects　of　the　number　of　wet/dry　cycles　and　FRP　layers,　and　FRP　reinforcing　sequence　on　the　efficiency　of　reinforcement　are　studied.　The　microstructure　of　FRP-concrete　interface　is　observed　by　SEM.　The　variations　in　bond　properties　of　FRP-concrete　interface　under　extreme　conditions　under　tension　are　investigated.　Experimental　results　show　at　the　early　stage　of　wet/dry　cycles,　the　strengths　of　concrete　and　epoxy　resin　increase,　and　further　interface　bond　strength　enhances.　As　wet/dry　cycles　forward,　defects　and　loose　microstructure　form　in　both　FRP　and　concrete,　and　the　interface　bond　strength　decreases.　Under　identical　conditions,　the　interface　bond　strength　of　sample　strengthened　by　FRP　after　wet-dry　cycles　is　higher　than　that　of　sample　strengthened　before　wet-dry　cycles.　FRP-concrete　bond　strength　is　related　to　the　number　of　wet-dry　cycles.