Precast　monolithic　structures　are　increasingly　applied　in　construction.　Such　a　structure　has　a　performance　somewhere　between　that　of　a　pure　precast　structure　and　that　of　a　cast-in-place　structure.　A　precast　concrete　frame　structure　is　one　of　the　most　common　prefabricated　structural　systems.　The　post-pouring　joint　is　important　for　controlling　the　seismic　performance　of　the　entire　precast　monolithic　frame　structure.　This　paper　investigated　the　joints　of　a　precast　prestressed　concrete　frame　structure.　A　reversed　cyclic　loading　test　was　carried　out　on　two　precast　prestressed　concrete　beam-column　joints　that　were　fabricated　with　two　different　concrete　strengths　in　the　keyway　area.　This　testing　was　also　performed　on　a　cast-in-place　reinforced　concrete　joint　for　comparison.　The　phenomena　such　as　joint　crack　development,　yielding,　and　ultimate　damage　were　observed,　and　the　seismic　performance　of　the　proposed　precast　prestressed　concrete　joint　was　determined.　The　results　showed　that　the　precast　prestressed　concrete　joint　and　the　cast-in-place　joint　had　a　similar　failure　mode.　The　stiffness,　bearing　capacity,　ductility,　and　energy　dissipation　were　comparable.　The　hysteresis　curves　were　full　and　showed　that　the　joints　had　good　energy　dissipation.　The　presence　of　prestressing　tendons　limited　the　development　of　cracks　in　the　precast　beams.　The　concrete　strength　of　the　keyway　area　had　little　effect　on　the　seismic　performance　of　the　precast　prestressed　concrete　joints.　The　precast　prestressed　concrete　joints　had　a　seismic　performance　that　was　comparable　to　the　equivalent　monolithic　system.