Due　to　low　tensile　strength　and　ductility　of　conventional　concrete,　concrete-filled　steel　tubular　(CFST)　structures　have　limited　application　for　tension　even　bending.　In　order　to　explore　the　full　function　of　CFST　tension　members　like　chord　of　CFST　truss　girder,　a　mix　proportion　of　reactive　powder　concrete　(RPC)　from　ordinary　materials　was　created　and　a　series　of　direct　tension　tests　of　reactive　powder　concrete-filled　steel　tubular　(RPC-FST)　members　with　different　steel　fiber　admixture　and　curing　regimes,　were　conducted.　By　comparing　sectional　resistances　and　axial　rigidities　of　RPC-FST　specimens　with　RPC　as　well　as　steel　tube　counterparts,　a　structural　design　method　based　on　the　formulas　for　conventional　CFST　tension　member　was　discussed.　It　was　shown　from　the　test　that　RPC-FST　composed　of　local　materials　had　excellent　tensile　resistance,　axial　rigidity　and　ductility　that　met　the　structural　requirements　for　CFST　tension　members　in　bridge　engineering.　The　proposed　practical　algorithms　well　predict　sectional　resistances　and　axial　rigidities　of　RPC-FST　in　tension.