Fiber-reinforced　polymer　(FRP)　wraps　as　external　confining　device　have　been　employed　to　enhance　the　performance　of　concrete-filled　steel　tube　(CFST)　columns,　and　the　axial　compressive　behavior　of　FRP-confined　CFST　columns　have　been　intensively　investigated.　Although　FRP　confinement　could　enhance　the　mechanical　performance　of　CFST　columns　with　a　high-strength　steel　(HSS)　tube,　they　are　prone　to　buckling　failure,　especially　under　eccentric　compression.　The　purpose　of　this　study　is　to　experimentally　investigate　the　mechanical　performance　of　polyethylene　terephthalate　(PET)　FRP-confined　CFST　columns　(PFCCFSTs)　under　eccentric　compression.　A　total　of　eight　circular　PFCCFSTs　were　tested　for　investigating　the　effects　of　a　range　critical　parameters　(i.e.,　column　slenderness　ratio,　eccentricity-to-diameter　ratio,　and　thickness　of　the　PET　FRP　jacket)　on　the　eccentric　compressive　behavior　of　PFCCFSTs.　The　test　results　show　that　the　typical　load-strain　curve　of　PFCCFSTs　generally　consists　of　an　initial　linear　ascending　segment,　followed　by　a　transition　segment　and　a　descending　segment.　It　is　demonstrated　that　the　load　deterioration　of　PFCCFSTs　is　more　sensitive　to　the　increase　of　eccentricity-to-diameter　ratio　than　the　slenderness　ratio,　while　the　PET　FRP　thickness　has　little　influence　on　the　load　bearing　capacity　of　PFCCFSTs.　The　predictions　from　a　theoretical　model　are　compared　with　experimental　results,　and　demonstrate　that　the　model　underestimates　the　ultimate　lateral　deflections　due　to　the　ignorance　of　the　strain　gradient　effect　in　eccentrically　loaded　columns.　©　2022　The　Authors