Based　on　the　finite　element　(FE)　software　ABAQUS,the　behavior　of　round-end　concrete-filled　steel　tubular　(RECFST)　members　under　eccentric　tension　is　studied.FE　results　agree　well　with　the　experimental　results.Based　on　the　FE　model,mechanic　and　parametric　analysis　are　carried　out.Mechanic　analysis　shows　that　RECFST　members　have　high　strength　and　the　arc　segments　of　steel　tube　provide　an　effective　confinement　to　core　concrete.Meanwhile,the　steel　tube　is　supported　by　the　core　concrete　and　its　tensile　strength　is　significantly　improved.The　parametric　analysis　demonstrates　that　the　steel　strength,steel　ratio　and　height　to　width　ratio　have　moderate　influences　on　the　shape　of　the　tension-bending　curve.Finally,based　on　the　parametric　analysis,a　simplified　formula　is　proposed　to　predict　the　strength　of　RECFST　specimens　under　the　eccentric　tension.The　predicted　results　using　simplified　formula　agree　well　with　FE　results,which　can　provide　a　reference　for　engineering　design.　©　2020,　Progress　in　Steel　Buiding　Structures　All　right　reserved.