The　system　of　the　extradosed　cable-stayed　bridge　constantly　changed　during　construction.　In　order　to　obtain　the　reasonable　finished　dead　state　and　ensure　the　structural　safety　during　construction,　it　is　necessary　to　deeply　investigate　the　construction　stages.　A　finite　element　model　of　a　real　long-span　railway　extradosed　cable-stayed　bridge　built　in　China　was　established　by　using　MIDAS/Civil　finite　element　software　to　analyze　the　stress　and　deformation　of　the　bridge　based　on　reasonable　construction　state.　The　results　show　that　it　should　be　paid　attention　to　the　longitudinal　displacement　at　the　top　of　the　tower　after　the　middle-span　closure　stage,　and　the　vertical　displacement　of　the　girder　in　the　longest　single　cantilever　stage.　The　maximum　compressive　stresses　of　the　tower　appeared　after　the　cable　tensioning　and　the　girder　appeared　when　the　bridge　is　in　the　longest　single　cantilever　state　are　less　than　the　design　compressive　strength　of　concrete　C55.　The　maximum　tensile　stress　of　the　girder　appeared　when　the　bridge　is　in　the　longest　double　cantilever　state　is　less　than　the　design　tensile　strength　of　concrete　C55.　©　2022　IABSE　Symposium　Prague,　2022:　Challenges　for　Existing　and　Oncoming　Structures　-　Report.　All　rights　reserved.