The　stainless　steel　tubular　truss　is　known　for　dealing　with　corrosion　problem　of　tubular　truss,　and　mechanical　properties　of　tubular　truss　can　be　improved　ulteriorly　by　filling　concrete　to　effectively　avoid　local　buckling　of　steel　tubular.　To　study　the　influence　of　the　filling　position　of　steel　fiber　reinforced　concrete　(SFRC)　on　flexural　behavior　of　stainless　steel　tubular　truss,　four-point　bending　tests　were　carried　out　on　four　specimens.　The　specimens　consist　of　three　SFRC-filled　stainless　steel　tubular　trusses　and　a　hollow　section　stainless　steel　tubular　truss　as　control　group.　The　experimental　results　show　that　filling　the　chord　with　SFRC　can　significantly　improve　the　bearing　capacity　of　the　stainless　steel　tubular　truss.　At　the　same　time,　the　internal　mechanism　of　SFRC　improving　the　bearing　capacity　of　the　structure　is　analyzed　from　the　perspectives　of　failure　mode,　overall　deformation　characteristics　and　strain　development　of　material.　The　effects　of　several　different　SFRC　filling　methods　on　improving　the　mechanical　performance　of　specimens　were　compared.　Finally,　the　finite　element　method　is　used　to　analyze　the　tested　specimens.　The　accuracy　of　the　proposed　finite　element　modeling　is　proved,　and　the　optimal　filling　method　to　make　full　use　of　the　material　property　of　SFRC　is　obtained　through　stress　analysis.