We　prepared　the　self-compacting　expensive　C-50　concrete　that　possesses　good　workability,　high　strength,　high　early　strength　and　expansive　properties,　The　self-strains　of　steel　tube　caused　by　the　core　concrete　expansion　and　the　maximum　bearing　capacity　of　the　self-compacting　expensive　concrete　filled　steel　tube　were　studied,　and　the　results　show　that　the　core　concrete　is　under　three-dimensionally　suppressed,　and　the　bearing　capacity　is　7%　more　than　that　of　ordinary　concrete　filled　steel　tube.　The　achievements　in　this　paper　have　been　applied　in　the　real　steel　tube　arch　bridges,　and　the　engineering　effect　is　good.