The　thermal　field　test　and　analysis　of　a　concrete　filled　steel　tubular　(CFST)　truss　arch　bridge　were　carried　out　in　this　paper.　The　analysis　results　demonstrate　that　the　temperature　distributions　on　the　top　and　bottom　chords　of　the　CFST　truss　arch　are　similar　in　the　series　parallel　to　the　direction　of　sunshine　movement.　And　the　temperature　distribution　on　the　left　and　right　chords　are　similar　in　the　series　perpendicular　to　the　direction　of　sunshine　movement.　The　temperature　distribution　and　the　average　temperature　of　each　chord　are　similar　to　those　of　a　singular　tube　CFST　rib.　The　axis　orientation　of　the　arch　rib　has　little　influence　on　the　average　temperature　in　the　arch　rib　section.　The　average　temperature　of　the　web　members　is　higher　than　that　of　the　chord　members　if　there　exists　solar　radiation,　wheras　the　difference　is　small　without　solar　radiation.　The　average　temperature　in　each　chord　is　so　similar　that　the　thermal　stress　caused　by　the　average　temperature　difference　of　each　chord　can　be　neglected.　The　temperature　difference　between　the　web　and　chord　members　also　can　be　omitted　in　calculation　because　it　will　only　result　very　small　thermal　stress.　Therefore,　the　same　temperature　can　be　used　for　the　web　and　chord　members　in　the　thermal　stress　calculation　of　to　CFST　rruss　arch　rib.