We　studied　the　structural　performance　of　steel-concrete　composite　segments　in　a　self-anchored　suspension　bridge　through　a　model　test　based　on　the　Lecheng　Bridge　in　Lecheng　Pioneer　District,　Boao,　Qionghai　City,　Hainan　Province,　and　refined　finite　element　analysis　to　ensure　the　smooth　transfer　of　internal　force　in　steel-concrete　composite　segments　in　hybrid　girders.　First,　a　partial　section　1　∶4　scaled　test　model　was　designed　and　fabricated　in　accordance　with　the　principle　of　stress　equivalence　between　the　original　bridge　and　the　scaled　model.　The　specimen　was　then　multistep　loaded　with　up　to　1.7　times　the　ultimate　limit　load.　The　stress,　deformation,　and　failure　modes　obtained　from　the　experiment　were　compared　with　those　acquired　from　finite　element　analysis.　Finally,　a　segmental　model　with　a　whole　section　width　was　established　to　explore　the　transmission　mechanism　of　internal　forces.　Results　showed　that　under　load-bearing　conditions,　the　stress　distribution　in　the　composite　segment　was　rational,　and　the　structure　was　safe.　Given　that　the　stress　in　this　particular　composite　segment　was　highly　affected　by　the　hogging　moment,　the　potential　failure　mode　was　the　slip　between　the　steel　and　concrete　top　flanges　at　the　steel-concrete　joint　section.　Prestress　tendons　were　essential　for　bending　moment　transmission,　whereas　other　internal　forces　were　gradually　transmitted　to　concrete　by　the　bearing　plate　and　shear　studs.　These　results　can　provide　references　for　the　design　optimization　and　construction　control　of　similar　bridges.　©　2023　Editorial　Board　of　Journal　of　Harbin　Engineering.　All　rights　reserved.