The　unbonded　post-tensioned　precast　concrete　joint　based　on　PRESSS　(Precast　Seismic　Structural　System)　technology　has　a　simple　form,　convenient　construction,　and　strong　deformation-recovery　properties.　In　this　paper,　both　experimental　and　theoretical　analysis　methods　were　used　to　study　the　influence　of　different　energy　dissipation　components　on　the　seismic　performance　of　the　unbonded　post-tensioned　precast　concrete　joint.　First,　based　on　the　existing　＇plug-and-play＇　energy　dissipation　device,　this　paper　improved　its　construction　and　designed　two　types　of　joints　with　new　external　energy　dissipaters　and　internal　energy-dissipating　bars,　respectively.　Subsequently,　low-reversed　cyclic　loading　experiments　were　conducted.　The　two　joints＇　seismic　performance　indexes,　failure　mode,　hysteresis　curve,　skeleton　curve,　ductility　coefficient,　and　residual　deformation　were　compared　and　analyzed.　The　experimental　results　showed　that　internal　energy-dissipating　bars　exhibited　greater　energy　dissipation.　In　contrast,　the　joint　with　the　new　external　energy　dissipater　had　higher　initial　stiffness　than　the　joint　with　internal　energy-dissipating　bars.　In　addition,　the　force　transmission　mechanism　and　the　calculation　formula　of　the　initial　rotational　stiffness　of　the　joints　were　deduced　through　theoretical　analysis,　and　the　theoretical　derivation　was　further　verified　by　combining　the　experimental　values.　Overall,　both　joints　conformed　to　the　definition　of　semi-rigid　connections　in　EC3,　and　the　joint　design　conformed　to　the　＂strong　column　and　weak　beam,　strong　joint　and　weak　member＂　principle.　Finally,　a　new　anchoring　system　for　the　energy　dissipaters　is　proposed　to　ensure　the　effective　connection　between　the　energy　dissipater　and　the　bearing.