CFST-CSW　structure　is　a　type　of　newly-developed　composite　structure,　in　which　the　CFST　members　take　the　main　actions　and　the　CSW　works　as　connecting　components.　This　paper　reports　experimental　studies　on　two　CFST-CSW　arches　subjected　to　in-plane　loading　symmetrically　or　asymmetrically.　The　two　supports　of　each　arch　were　fixed　on　the　ground.　The　load-deformation　responses　of　both　arches　were　recorded,　including　the　strain　development　in　steel　tubes　and　corrugated　steel　webs　under　gradual　loading.　Both　arches　were　found　to　fail　in　an　in-plane　mode　well　after　the　maximum　strain　in　steel　tube　reached　its　yielding　strain.　The　experimental　results　reveal　the　mechanical　behavior　of　CFST-CSW　arch.　This　is　probablly　the　first　experimental　study　on　the　mechanical　behavior　of　CFST-CSW　arch.