Large　underground　spaces　are　complex　and　huge,　with　problems　such　as　fragmented　data　that　cannot　be　shared,　outdated　management　methods,　and　high　operation　and　maintenance　costs.　The　digitization　of　building　information　and　the　use　of　digital　twin　technology　can　effectively　improve　the　efficiency　of　building　operation　and　maintenance.　Using　information　technology　to　build　a　digital-twin-based　operation　and　maintenance　management　system,　the　huge　and　discrete　data　and　equipment　system　information　are　effectively　integrated　and　explored　for　application.　First,　we　analyze　the　shortcomings　of　the　traditional　delivery　and　operation　and　maintenance　methods　and　introduce　the　necessity　of　a　new　method　of　operation　and　maintenance　management　based　on　digital　twin;　then,　we　divide　the　operation　and　maintenance　information　of　the　construction　project　into　four　major　categories　of　spatial　information　and　eight　major　categories　of　equipment　information　and　complete　the　coding　work,　and　the　categorized　data　serve　as　the　data　basis　for　operation　and　maintenance;　second,　we　develop　a　digital　twin　operation　and　maintenance　management　platform　based　on　the　operation　and　maintenance　data　of　BIM;　finally,　we　carry　out　case　validation　for　the　three　major　constructions.　Finally,　case　validation　is　carried　out　for　three　major　buildings　and　a　large　underground　space　and　the　practical　application　shows　that　the　operation　and　maintenance　management　system　based　on　digital　twin　technology　provides　technical　guarantee　for　decentralized　information　and　system　integration　management　and　the　information　management　quality　and　efficiency　of　the　operation　and　maintenance　process　are　effectively　improved.　Through　the　practice　of　summarizing　the　experience,　which　is　worth　learning,　we　aim　to　create　a　large　underground　space　operation　and　maintenance　management　method　to　provide　a　reference.