In　order　to　study　the　seismic　behavior　of　cross-shaped　concrete-filled　steel　tubular　(CFST)　columns　under　diagonal　loading,　cyclic　experiments　on　nine　specimens　were　carried　out.　The　main　parameters　were　loading　angle　(0°　and　45°　),　concrete　strength　grade　(C50　and　C70),　axial　compression　ratio　(0,　0.25　and　0.5),　presence　or　absence　of　stiffener.　The　hysteretic　behavior　such　as　failure　mode,　horizontal　load-displacement　hysteretic　curve,　skeleton　curve,　ductility　and　cumulative　energy　dissipation　were　obtained　and　the　influences　of　different　parameters　were　analyzed.　A　finite　element　model　of　cross-shaped　CFST　columns　was　developed.　It＇s　found　that　the　calculated　results　agree　well　with　the　test　results.　The　test　results　show　that　the　cross-shaped　CFST　columns　have　good　hysteretic　behavior　and　the　displacement　ductility　coefficients　of　all　specimens　are　greater　than　3.5.　The　axial　compression　ratio　has　great　influence　on　the　hysteretic　behavior　of　cross-shaped　columns.　Increasing　axial　compression　ratio　results　in　decreasing　load　bearing　capacity,　faster　degradation　of　stiffness,　weaker　ductility　and　energy　dissipation.　With　the　increase　of　concrete　strength,　the　load　bearing　capacity　increases.　Under　the　condition　of　great　axial　compression　ratio,　the　ductility　drops　dramatically　due　to　higher　concrete　strength.　Compared　with　the　specimens　without　stiffeners,　the　specimens　with　inner　stiffeners　welded　intermittently　exhibit　about　8%　higher　load　bearing　capacity,　slightly　better　ductility　and　energy　dissipation.　The　specimens　at　45°　loading　angle　show　slightly　superior　hysteretic　behavior　than　the　specimens　at　0°　loading　angle.　©　2020,　Editorial　Office　of　Journal　of　Building　Structures.　All　right　reserved.