Socket　connection　is　commonly　used　for　connections　between　precast　components,　which　has　the　advantages　of　good　integrity　and　high　construction　fault　tolerance.　To　further　investigate　the　bond-slip　behavior　and　improve　the　engineering　design　of　Ultra　High-Performance　Concrete　(UHPC)-filled　concrete-filled　steel　tube　(CFST)　column-beam　socket　connections,　this　paper　conducted　bond-slip　experiments　on　UHPC-filled　CFST　socket　connections　(UCSC)　with　different　parameters　(socket　depth,　presence　of　studs)　to　reveal　their　bond-slip　properties.　In　addition,　to　conduct　further　parametric　analysis,　a　reliable　finite　element　model　(FEM)　of　the　UCSC　joint　was　developed.　Based　on　the　experimental　data　and　finite　element　analysis　(FEA)　results,　a　simplified　calculation　equation　and　a　normalized　bond-slip　relationship　model　was　established　to　estimate　the　bond-slip　performance　of　UCSC.　The　research　results　suggested　that　the　bond-slip　behavior　of　the　UCSC　was　sensitive　to　the　socket　depth,　the　presence　of　studs　and　the　diameter　of　CFST.　The　FEM　is　capable　of　estimating　the　force-displacement　relationship　and　the　damage　distribution　of　the　UCSC　joint　under　vertical　loads.　The　developed　simplified　equation　and　normalized　bond-slip　relationship　have　been　validated,　and　can　be　employed　to　predict　the　ultimate　bonding　bearing　capacity　and　the　bond-slip　relation　of　UCSC　joints,　respectively.　Finally,　design　recommendations　were　proposed　for　the　engineering　design　of　UCSC.　The　UCSC　method　is　required　to　ensure　a　socket　depth　at　least　1.0D　and　a　certain　number　of　shear　studs　to　connect　the　column-beam　joint.　©　2024　Institution　of　Structural　Engineers