Concrete　filled　rectangular　steel　tubular　(CFRST)　trusses　are　composed　of　CFRST　chords　and　rectangular　hollow　section　(RHS)　braces.　To　analyze　the　flexural　behavior　of　CFRST　trusses,　a　series　of　10　experiments　were　re-analyzed.　Effects　of　infilled　concrete　and　longitudinal　perfobond　leister　(PBL)　stiffeners　in　the　chords　were　investigated.　Experimental　results　indicated　that　the　flexural　stiffness　and　strength　of　the　CFRST　trusses　were　improved　significantly　compared　to　the　RHS　trusses.　Joint　strength　of　the　trusses　was　enhanced　by　infilled　concrete　under　compression　and　PBL　stiffeners　under　tension.　The　failure　modes　of　the　truss　were　changed　after　the　joints　were　strengthened.　Axial　force　distribution　of　the　truss　members　coincided　well　with　pin-jointed　analysis　results.　Axial　stiffness　of　the　CFRST　chords　under　tension　and　compression　was　investigated.　Further-more,　an　approach　to　determine　the　flexural　strength　of　the　CFRST　trusses　was　introduced　and　validated　against　the　experimental　results.　The　efficient　factors　of　the　truss　members　which　can　be　used　as　indexes　for　optimal　design　were　proposed.