This　test　researches　one　monolithic　connection　and　3　hybrid　precast　unbonded　post-tensioned　concrete　connections　under　reversed　cyclic　loading.　Such　parameters　as　PT　initial　post-tensioning　force,　type　and　area　of　grouted　mild　steel　are　described.　Experiment　shows　that　used　grouted　mild　steel　can　improve　the　energy　dissipation　and　bearing　capacity　of　specimens.　The　hybrid　precast　specimens　have　desirable　seismic　characteristics　such　as　a　self-centering　capability　and　an　ability　to　undergo　large　nonlinear　displacements　with　little　damage.　This　study　was　initiated　to　provide　data　for　the　development　of　a　rational　and　economical　design　and　construction　procedure　for　such　connections　in　seismic　active　regions.