Lantian　Fifth　Changjiang　River　Bridge　in　Luzhou　is　a　half-through　steel　box　arch　bridge　with　a　span　of　570 m.　It　is　the　largest　span　half-through　steel　box　arch　bridge　under　construction.　The　structural　design　and　construction　method　of　the　arch　bridge　are　presented　and　the　design　technical　points　is　indicated　in　this　paper.　The　long-span　steel　box　arch　bridge　is　simulated　by　MIDAS/Civil　to　analyze　the　mechanical　properties　in　the　completion　state　and　the　construction　stage,　which　can　provide　reference　for　the　design　and　construction　of　similar　engineering　schemes.　©　The　Author(s),　under　exclusive　license　to　Springer　Nature　Switzerland　AG　2025.