Polyethylene　terephthalate　(PET)　fiber　has　attracted　significant　attention　for　reinforced　concrete　(RC)　structure　rehabilitation　due　to　its　large　rupture　strain　(LRS;　more　than　7%)　characteristic　and　recyclability　from　waste　plastic　bottles.　This　study　presents　a　dynamic　tensile　test　of　PET　fiber　bundles　performed　using　a　drop-weight　impact　system.　Results　showed　that　the　tensile　strength　and　the　elastic　modulus　of　the　PET　fiber　bundles　increased,　whereas　the　failure　strain　and　the　toughness　decreased　with　the　increasing　strain　rate　from　1/600　to　160　s(-1).　In　addition,　the　performance　of　concrete　confined　with　the　PET　fiber-reinforced　polymer　(FRP)　under　impact　loading　was　investigated　based　on　a　75　mm-diameter　split　Hopkinson　pressure　bar　(SHPB)　device　and　a　drop-weight　apparatus.　For　the　SHPB　test,　owing　to　the　large　rupture　strain　property　of　PET　FRP,　the　PET　FRP-confined　concrete　exhibited　significantly　better　performance　under　impact　loading　compared　to　its　counterpart　confined　with　carbon　FRPs　(CFRPs).　During　the　drop-weight　test,　the　confinement　of　the　PET　FRP　composites　to　the　concrete　columns　as　external　jackets　not　only　improved　the　peak　impact　force,　but　also　prolonged　the　impact　process.