The　installation　of　energy　dissipation　devices　on　building　structures　can　significantly　reduce　seismic　damage.　A　brief　review　of　first,　second　and　third　generation　performance-based　seismic　design　(PBSD)　theories,　and　a　comparative　analysis　of　existing　PBSD　methods　for　energy-dissipated　structure　systems　confirms　that　design　methods　based　on　force,　displacement,　and　energy　are　inadequate.　A　more　comprehensive　approach　is　the　damage-based　design　method,　which　can　evaluate　the　seismic　performance　of　structures.　However,　due　to　the　lack　of　an　analytical　relationship　between　the　additional　equivalent　damping　ratio　(AEDR)　of　dampers　and　the　damage　degree　of　the　main　structure,　the　current　performance　design　method　can　only　predict　the　expected　damage　via　an　iterative　adjustment　analysis　of　damper＇s　design　parameters.　The　authors　addressed　this　problem　by　analyzing　the　damage　mechanism　of　the　energy-dissipated　structure　system＇s　core　area　from　the　perspective　of　energy　dissipation.　It　is　established　an　analytical　relationship　between　the　AEDR　and　the　damage　index　of　the　main　structure　with　dampers　via　a　damage　model　based　on　the　energy　difference　ratio　and　the　time-varying　AEDR　calculation　of　dampers　subjected　to　ground　motions.　With　this　new　approach　to　seismic　vulnerability　analysis,　the　performance　design　flow　of　the　seismic　structure　system　is　based　on　damage　control.　A　case　study　verifies　the　accuracy　of　the　damage-degree　based　AEDR　calculation.　The　proposed　damage-based　method　effectively　controls　the　damage　degree　of　the　main　structure　to　the　expected　damage　target.　This　method　is　compatible　with　the　displacement-based　design　method,　and　which　also　enriches　the　research　contents　of　structural　seismic　design　and　damage　analysis　in　the　third　generation　PBSD.