The　heavy　dead　weight　has　restricted　the　development　of　the　concrete　arch　bridge.　A　new　composite　arch　of　steel　truss　web　and　concrete　flange　(STW-RC)　was　proposed.　Meanwhile　a　test　of　STW-RC　arch　model　under　the　non-symmetric　in-plane　loads　was　carried　out　based　on　the　trial　design.　The　results　show　that　this　new　composite　arch　bridge　was　feasible.　But　node　played　such　a　key　role　in　the　capacity　that　some　measurements　to　strengthen　it　were　required.