As　it　is　very　difficult　to　accurately　get　the　whole　dynamic　parameters　and　model　information　of　large-scale　structural　damage　identification,　dimension　and　step　damage　identification　method　is　established　to　directly　take　vibration　parameters　as　damage　indexes.　This　method　doesn＇t　need　to　get　complete　structure　dynamic　parameters.　Damage　identification　method　of　treating　the　second　derivative　of　transverse　vibration　acceleration　and　the　second　derivative　of　axial　vibration　mode　as　damage　indexes　is　put　forward　separately　according　to　the　vibration　character　of　the　main　components　in　frame　structure.　The　first　step　of　high　rise　frame　structure　identification　is　to　carry　out　modal　parameters　identification　of　layer　to　determine　the　damaged　layer,　then　axial　vibration　or　acceleration　signal　is　used　to　identify　damaged　component　and　location　according　to　the　transverse　vibration,　A　number　of　damaged　components　indicate　that　the　frame　structure　can　be　divided　into　substructures　to　identify　damage　location　step　by　step,　followed　by　the　identification　of　the　damaged　components.　Simulation　of　a　three-span　12-layer　R.C　frame　structure　damage　identification　shows　the　feasibility　and　accuracy　of　transverse　vibration,　axial　vibration　damage　index　and　the　proposed　dimension　and　step　damage　identification.　©　2011　ASCE.