In　a　concrete　filled　steel　tubular　(CFST)　truss　arch　bridge,　arch　ribs　usually　consist　of　several　chords.　Different　concrete-filling　schemes　will　produce　different　initial　stresses　in　the　steel　tube　chords.　Based　on　the　existing　CFST　truss　arch　bridge　of　Paojiang　River,　the　full　process　of　construction　was　simulated　by　using　MIDAS,　in　which　the　magnitude　of　initial　stress　was　discussed　and　the　concrete-filling　schemes　were　analyzed.　Finally,　the　load-carrying　capacity　of　this　bridge　considering　the　initial　stress　was　calculated