In　recent　years,　for　reducing　the　impact　of　PM10　and　PM2.5　pollution　on　the　atmospheric　environment,　the　construction　of　closed　material　yard　is　being　promoted　in　China.　The　Code　for　Design　of　Steel　Structures　(GB　50017-2017)　introduced　the　direct　analysis　method　for　stability　analysis　and　design,　based　on　the　GB　50017-2003　of　first-order　elastic　analysis　method.　In　this　paper,　structural　design　and　finite　element　analysis　for　a　150-meter-span　arch　truss　steel　structure　is　carried　on,　to　compare　the　differences　between　the　new　and　old　codes.　And　it　is　clarified　that　if　a　long-span　space　frame　structure　is　designed　under　the　new　code,　steel　can　be　used　more　reasonably　and　economically　on　the　premise　of　meeting　the　requirements　of　relevant　design　codes..　Copyright　©　2018　by　The　Hong　Kong　Institute　of　Steel　Construction.