The　bolt-slip　inevitably　occurred　in　the　splicing　zone　of　bolted-connection　prefabricated　shear　walls　(BPSWs)　while　suffering　the　seismic　load.　The　existence　of　bolt-slip　could　increase　the　deformation　and　energy　dissipation,　and　the　damage　index　calculated　by　the　conventional　Park-Ang　damage　model　would　be　underestimated　as　well.　To　solve　the　issues,　the　mechanism　of　bolt-slip　was　investigated,　and　the　equations　of　displacement　induced　by　bolt-slip　were　derived.　Subsequently,　a　modified　model　was　proposed　by　considering　the　effect　of　bolt-slip　on　the　damage　index.　Additionally,　to　verify　the　modified　model,　three　BPSWs　with　aspect　ratios　of　1.0,　1.4,　1.8,　respectively,　and　a　cast-in-place　shear　wall　(RSW)　with　an　aspect　ratio　of　1.8　were　tested　under　reversed　cyclic　load.　The　results　show　that　it　has　an　increase　of　19.5%　and　6.6%　for　the　damage　index　of　BPSW　with　or　without　considering　the　bolt-slip　compared　with　the　RSW,　respectively.　This　indicates　that　the　results　of　damage　assessment　are　much　more　accessible　to　the　real　condition　of　BPSWs.　At　last,　the　relationship　of　damage　level　and　damage　index　was　established,　which　shows　a　great　agreement　with　the　cyclic　test　results.　It　is　concluded　that　the　modified　model　and　damage　level　proposed　in　this　paper　are　applicable　to　assessing　the　damage　on　BPSWs.　©　2023　Elsevier　Ltd