Fiber　reinforced　polymer　(FRP)　is　one　of　the　alternatives　to　steel,　and　can　be　directly　used　in　seawater　sea　sand　concrete　(SSC).　But　FRP　material　still　has　durability　problems　in　corrosive　environments,　which　is　one　of　the　hot　and　difficult　issues　of　current　research.　Based　on　the　existing　literature,　this　paper　combs　the　degradation　of　the　long-term　property　of　FRP　bars　and　the　durability　of　FRP　bar　reinforced　SSC　(FRP-SSC)　structures　in　the　marine　environment.　The　combination　of　the　alkaline　environment　of　concrete　and　the　salt　ions　in　sea　sand　and　seawater　aggravates　the　dissolution　of　the　resin　and　debonding　of　the　fiber-resin　interface　of　FRP　bars　(particularly　for　BFRP　bars).　Therefore,　the　mechanical　properties　of　FRP　bars　degrade　with　high　variability　which　leads　to　the　reduction　of　bonding　between　SSC　and　FRP　bars.　Additionally,　the　bearing　capacity　of　FRP　bar/steel-FRP　composite　bar　(SFCB)　reinforced　SSC　components　in　marine　environments　decreases,　and　the　failure　mode　of　components　changes.　The　current　codes　use　environmental　reduction　factors　in　the　durability　design　of　FRP　bar　reinforced　concrete　structures.　But　the　values　of　reduction　factors　are　conservative.　Finally,　it　is　pointed　out　that　the　quantification　of　variability　for　the　mechanical　property　of　FRP　bars　after　long-term　service,　and　the　time　-dependent　reliability-based　design　methods　of　components　are　needed　for　further　studies.