It　is　very　important　to　quantify　the　damage　degree　of　the　components　in　the　seismic-damaged　structure　according　to　the　reasonable　damage　physical　quantity,　and　to　guide　the　rapid　repair　of　the　seismic-damaged　structure,　so　as　to　improve　the　seismic　performance　of　the　structure　to　meet　the　use　requirements.　In　view　of　the　fact　such　as　the　measurable　information　of　the　actual　seismic-damaged　structure　is　limited,　the　damage　degree　is　difficult　to　quantify,　the　process　of　repair　and　reinforcement　is　difficult　to　simulate,　and　the　performance　of　the　structure　after　repair　and　reinforcement　is　difficult　to　evaluate,　the　relationship　between　the　end　curvature　of　the　beam　and　column　component　and　the　top　displacement　is　established,　and　the　relationship　among　the　residual　displacement,　displacement,　curvature　and　damage　index　is　clarified.　The　method　and　process　of　simulating　the　repair　and　reinforcement　of　the　component　in　the　finite　element　are　proposed.　According　to　the　different　physical　quantity　of　damage,　the　method　of　quantifying　the　damage　of　components　is　proposed.　In　addition,　according　to　different　damage　physical　quantity　and　repair　strategy,　a　five-story　reinforced　concrete　seismic-damaged　structure　is　quickly　repaired,　and　the　seismic　performance　of　the　repaired　structure　is　evaluated,　then　the　seismic　vulnerability　is　analyzed.　The　results　show　that　the　rapid　repair　of　structures　damaged　by　earthquake　can　effectively　reduce　the　risk　of　serious　damage　and　collapse　in　earthquake.　The　seismic　performance　of　the　structure　can　be　maximally　improved　by　quantifying　the　damage　of　the　component　according　to　the　residual　displacement　drift　and　guiding　the　rapid　repair　of　the　structure.　Among　the　two　strategies　of　layer　selection　and　part　selection,　the　former　has　better　repair　effect.　©　2022,　Editorial　Board　of　Journal　of　Vibration　Engineering.　All　right　reserved.