There　is　no　relevant　normative　guidance　for　the　construction　deformation　control　of　the　super-large-span　flat　underground　cavern　with　a　span　greater　than　50　m.　Therefore,　the　theoretical　analysis　and　numerical　simulation　methods　are　used　to　study　the　deformation　control　standards　for　large-span　caverns　based　on　an　actual　project.　To　assess　the　stability　of　a　large-span　cavern,　the　surrounding　rock　strain　is　used　as　a　rock　mass　strength　index.　The　settlement-span　ratio　is　proposed　as　the　deformation　control　standard,　and　a　correlation　between　cavern　crown　settlement　S　and　rock　mass　ultimate　strain　ε　is　proposed.　Furthermore,　the　deformation　control　standards　applicable　to　each　excavation　stage　are　proposed,　and　the　classification　management　method　for　deformation　control　standards　is　developed.　The　results　show　the　following:　(1)　The　allowable　settlement　deformation　of　a　large-span　cavern　is　related　to　the　geometry　of　the　cavern　and　the　strength　characteristics　of　surrounding　rocks.　(2)　Regarding　the　excavation　scheme　of　partial　excavation　and　reserved　rock　pillar　for　the　case　study　of　the　large-span　cavern,　the　deformation　of　the　cavern　mainly　occurs　in　the　large-span　cavern　stage.　©　2022,　Editorial　Office　of　Tunnel　Construction.　All　rights　reserved.