Accidental　cable　failure　may　occur　for　complicated　suspend-dome　structures,　resulting　in　the　dynamic　impact　effect　on　structures.　This　study　presents　simplified　analysis　methods　for　evaluating　suspend-dome　structures　when　sudden　cable　failure　occurs.　An　implicit　analysis　method　of　improved　alternative　load　path　(IAM-IAP)　was　employed　to　simply　simulate　the　cable　failure　process　of　the　beam-string　structure.　The　IAM-IAP　was　also　validated　by　comparing　the　calculated　results　with　the　existing　test　results　for　the　truss　string　structure.　The　parameters　of　the　cable　failure　process　(i.e.,　failure　time,　failure　path,　and　damping　ratio)　were　analyzed,　and　suitable　values　were　recommended.　Based　on　the　IAM-IAP,　a　finite　element　model　of　multi-loop　cable-string　suspend-dome　structure　(MCSS)　was　established　and　benchmarked　by　verifying　the　static　responses　during　construction.　Dynamic　responses　(i.e.,　time　histories,　displacements,　axial　forces,　and　dynamic　amplification　factors)　of　MCSS　were　systematically　investigated.　The　dynamic　amplification　factor　may　be　larger　than　2,　exceeding　the　suggested　value　of　existing　specifications.　A　static　equivalent　method　with　reasonable　prediction　accuracy　was　also　proposed　to　simply　assess　the　dynamic　responses　of　suspend-dome　structures　subjected　to　sudden　cable　failure.　©　2022,　Korean　Society　of　Steel　Construction.