The　theory　and　method　of　extenics　were　applied　to　establish　classical　field　matter　elements　and　segment　field　matter　elements　for　reinforced　concrete　structure.　A　matter-element　model　for　structure　was　established　based　on　four　matter-elements,　which　were　internal　damage　index,　maximum　inter-storey　drift,　number　of　inelastic　cycles　and　energy-concentrated　quotient.　A　matter-element　analysis　method　for　seismic　damage　evaluation　on　reinforce　concrete　structure　was　presented.　This　method　can　be　accomplished　by　nappe　structure　analysis　and　capacity　spectrum　method,　while　considering　multiple　factors　for　performance-based　design,　such　as　displacement　and　energy.　This　method　was　verified　clearly　through　the　practical　example,　and　the　rationality　and　validity　were　demonstrated.　By　this　practice　example,　the　model　proves　to　be　accurate　and　logical　in　evaluating　the　degree　of　structural　seismic　damage.