The　cable-membrane　structure　is　easily　affected　by　factors　in　the　external　environment　such　as　wind　load　and　temperature　during　its　operation　and　maintenance　process，which　leads　to　the　relaxation　of　joints　and　the　failure　of　components　and　thus　seriously　affects　its　safety　performance.　Therefore，how　to　realize　an　accurate　simulation　of　its　safety　state　during　its　service　period　and　effectively　improve　its　collapse　resistance　performance　while　reducing　the　cost　of　health　monitoring　is　a　key　problem　that　the　intelligent　operation　and　maintenance　of　the　cable-membrane　structure　faces.　In　this　paper，a　failure　mechanism　analysis　method　for　the　components　in　a　cable-membrane　structure　based　on　digital　twin　was　proposed.　First，the　virtual　model　was　modified　at　the　geometric　and　physical　levels　to　form　a　high-fidelity　digital　twin　model，so　as　to　efficiently　and　accurately　map　the　stress　state　of　the　structure.　Then，based　on　the　twin　model，the　analysis　process　of　mechanical　response　before　and　after　the　component　failure　was　given.　The　component　failure　condition　was　set　in　the　twin　model　to　obtain　the　mechanical　response　law　of　the　structure.　According　to　the　changes　in　structural　mechanical　properties　before　and　after　the　failure，the　importance　coefficient　of　components　was　calculated　to　capture　the　key　stressed　components.　After　the　failure　of　key　components，the　internal　force　distribution　in　the　structure　was　analyzed，and　the　force　transfer　mechanism　before　the　collapse　of　the　structure　was　obtained.　The　cable-membrane　structure　of　Changchun　East　Toll　Shed　was　taken　as　a　research　object，and　the　feasibility　of　the　proposed　theoretical　method　was　verified.　The　application　results　of　the　case　study　show　that　the　established　twin　model　can　effectively　simulate　the　stress　state　of　the　structure，with　a　calculation　error　less　than　3%.　Through　the　analysis　of　the　structural　mechanical　properties　after　the　failure　of　various　components，the　mechanical　response　performance　law　and　key　stressed　components　were　obtained.　Based　on　the　mechanical　response　of　key　stressed　components　before　and　after　the　failure，the　force　transfer　mechanism　was　established，the　internal　force　transfer　path　was　obtained，and　the　structural　health　monitoring　object　was　clarified.　The　proposed　method　provides　a　reliable　support　for　the　formulation　of　intelligent　operation　and　maintenance　strategies　for　structural　safety　and　the　improvement　in　structures’　collapse　resistance　performance.　©　2025　Tianjin　University.　All　rights　reserved.