In　order　to　master　the　mechanical　behaviors　of　vertical　connection　and　correct　design　in　prefabricated　reinforced　concrete　(PRC)　structures　the　strength　degeneration　and　stiffness　degeneration　of　the　connection　under　repeated　loading　are　analysed　based　on　test　results　and　theoretical　analysis.　It　concludes　that　degeneration　rate　(DR)　of　concrete　strength　in　connection　decreases　with　connection　width,　but　the　DR　of　connecting　rod　strength　involves　only　shear-friction　coefficient,　the　DR　of　connection　strength　decreases　with　connection　width　and　changes　with　connecting　rod　nonlinearly,　and　the　DR　of　connection　stiffness　decreases　with　connection　width,　but　has　not　much　with　connecting　rod.