This　paper　experimentally　and　numerically　investigated　the　flexural　behavior　of　steel-laminated　concrete　composite　girders.　The　laminated　concrete　deck　consists　of　a　reinforced　concrete　(RC)　layer　and　an　ultra-high-performance　concrete　(UHPC)　layer,　and　the　resulting　steel-laminated　concrete　composite　girder　is　referred　to　as　S-RC-UHPC　girder.　Experimental　tests　were　first　conducted　to　compare　the　flexural　behavior　of　three　composite　girders,　i.e.,　steel-reinforced　concrete　(S-RC)　girder,　steel-ultra　high　performance　concrete　(S-UHPC)　girder,　and　S-RC-UHPC　girder.　The　test　results　confirm　the　validity　of　using　S-RC-UHPC　girders.　Detailed　3D　finite　element　(FEM)　model　is　then　developed　and　benchmarked.　The　benchmarked　model　can　be　used　to　further　investigate　the　flexural　behavior　of　S-RC-UHPC　girders.