In　order　to　investigate　the　mechanical　performance　of　the　steel-concrete　composite　beam　bridge　under　temperature,　the　stress　and　shear　distribution　of　the　three-span　composite　continuous　beam　bridge　under　temperature　are　investigated　by　combining　finite　element　and　theoretical　methods.　The　results　show　that　the　maximum　error　ratios　of　the　longitudinal　stress　obtained　by　the　two　calculation　methods　are　8.7%　and　9.4%　under　the　system　temperature　and　temperature　gradient,　respectively.　The　maximum　errors　of　the　stress　curves　are　less　than　5%,　which　is　in　the　acceptable　range.　The　reasonableness　of　the　finite　element　calculation　results　is　proved　and　a　basis　for　the　mechanical　performance　analysis　of　the　combined　continuous　girder　under　temperature　is　provided.　©　Published　under　licence　by　IOP　Publishing　Ltd.