In　order　to　study　the　bearing　capacity　of　large　size　concrete　filled　steel　tubular　(CFST)　columns　and　the　influence　of　initial　eccentricity　and　imperfection　of　opening　hole　and　insertion　pipe　on　the　column,　taking　a　main　arch　rib　Φ　1200　×　24　mm　of　a　CFST　arch　bridge　as　research　prototype,　authors　designed　ten　CFST　column　specimens　whose　draw　ratios　are　3:1.　According　to　different　scales　of　1:2.4　and　1:4.8,　the　axial　and　eccentric　compression　tests　were　carried　out,　and　comparisons　on　test　values　and　calculated　values　by　several　domestic　codes　for　bearing　capacity　were　made.　Result　shows　that　test　values　are　all　larger　than　the　calculated　values　for　bearing　capacity　of　CFST　column,　and　the　ratio　of　bearing　capacity　of　large　size　specimen　and　calculated　value　is　almost　same　to　the　ratio　of　bearing　capacity　of　small　size　specimen　and　calculated　value.　However,　yield　stress　of　the　large　size　specimen　is　larger　than　that　of　the　small　size　specimen,　and　the　specimen　with　opening　hole　has　the　smaller　yield　stress　because　of　the　smaller　yield　stress　of　the　insertion　pipe.　The　calculated　values　of　bearing　capacity　according　to　the　code　CECS　28:90　is　closer　to　the　test　value,　while　the　safety　factor　of　the　bearing　capacity　calculated　by　the　code　DL/T　5085-1999　is　the　largest.　Eccentric　compression,　opening　hole　and　insertion　pipe　can　induce　to　the　decrease　of　bearing　capacity,　its　decreasing　amplitude　can　reach　22%　and　15%　separately.