In　order　to　realize　structural　repairable　function　after　earthquake,　an　earthquake-resilient　prefabricated　steel　frame　with　external　flange　cover　plates　(ERPSF-EFCP)　has　been　proposed.　The　ERPSF-EFCP　consists　of　a　circle　tubular　steel　column　with　cantilever　beam,　an　intermediate　beam　and　a　connecting　device.　The　frame　is　intended　to　dissipate　energy　through　the　plastic　deformation　or　slip　of　the　flange　cover　plates　(FCPs),　so　as　to　ensure　that　the　main　components　such　as　beams　and　columns　remain　elastic　and　realize　rapid　post-earthquake　repair.　Low-cycle　reciprocating　loading　tests　have　been　conducted　on　four　specimens,　and　the　load　carrying　capacity　and　the　failure　mode　of　the　frame　were　analyzed.　The　effects　of　the　thickness　of　the　FCPs,　the　number　of　the　bolts,　the　initial　defects　and　the　loading　protocol　on　the　seismic　performance　of　the　frame　were　studied.　The　results　show　that　the　ERPSF-EFCP　has　good　loading　carrying　and　energy　dissipation　capacity.　The　plastic　damage　is　mainly　concentrated　on　the　FCPs,　which　indicate　that　the　frame　can　be　repaired　after　the　earthquake.　After　several　rounds　of　repairs　and　with　residual　deformation,　the　ultimate　load　reduction　of　the　frame　is　about　0.1%,　and　the　energy　consumption　reduction　is　about　1.08%,　which　indicate　good　load　carrying　and　energy　dissipation　capacity　of　the　frame.　The　average　energy　consumption　reduction　of　the　frame　is　about　0.8%　per　loading　cycle,　which　indicates　stable　low　cycle　fatigue　performance　and　good　aftershock-resisting　capability　of　the　frame.　©　2023　Science　Press.　All　rights　reserved.