The　experimental　and　analytical　investigations　carried　out　on　large-scale　interior　precast　beam　to　column　joints　with　composite　slab　are　presented　in　this　paper.　Four　specimens　were　tested　under　reversed　cyclic　loading　that　simulated　earthquake-type　motions.　The　most　relevant　feature　of　the　joint　is　that　the　beam　reinforcement　on　the　bottom　was　formed　and　installed　with　anchor　head,　rather　than　bent　to　form　stand　90-degree　hooks　or　closed　loops.　The　performance　of　the　precast　concrete　connection　was　compared　with　that　of　the　monolithic　connection,　and　the　failure　pattern,　hysteretic　characteristic,　skeleton　curve,　displacement　ductility　and　energy　dissipation,　were　analyzed.　The　test　results　provided　some　information　about　the　seismic　behavior　of　the　large-scale　joint.　In　general,　the　performance　of　the　joint　was　satisfactory.　No　bond　problem　and　obvious　pinching　effect　were　observed　in　the　test,　and　specimen　behavior　was　ductile　and　joint　strength　was　almost　equal　to　that　of　monolithic　reinforced　concrete　construction,　however,　the　ductility　of　the　specimens　was　affected　by　the　ratio　of　column　to　beam　flexural　strength,　and　the　scope　of　application　was　recommended.