Temperature　field　tests　of　two　CFST　members　under　solar　radiation　were　carried　out,　in　which　one　was　placed　vertically　and　another　was　placed　horizontally.　Analyses　of　the　test　results　indicate　that　the　temperature　field　of　CFST　member　under　solar　radiation　is　unsymmetrical.　Temperature　in　center　point　is　influenced　by　all　direction＇s　temperature　variation,　but　more　by　the　solar　radiation　direction.　The　lowest　surface　temperature　of　the　two　members　occurs　at　the　same　time,　and　is　close　to　air　temperature.　Except　the　center　point,　the　lag　of　temperature　variation　of　the　member　to　atmosphere　increase　in　radial　direction　to　the　center　point.　Temperature　varies　more　great　in　the　surface　exposed　to　the　sunshine　than　in　the　shade.　Temperature　variation　of　two　members　is　different　because　of　different　placed　way.　Under　the　same　solar　radiation,　the　top　temperature　of　the　center　point　of　horizontally　placed　member　occurs　one　hour　earlier　than　that　of　the　vertically　placed　one;　temperature　variation　of　the　horizontally　placed　member　is　greater　than　that　of　the　vertically　placed　one.　Analysis　shows　that　the　radial　temperature　distribution　can　be　demonstrated　by　cubic　polynomial.