A　large　scaled　specimen　of　the　concrete　core　wall　with　aspect　ratio　of　3.14,　confined　with　reinforced　frame,　was　tested　under　pseudo-static　loadings　to　investigate　its　seismic　behavior　including　the　failure　mechanism,　hysteretic　behavior,　load-carrying　capacity,　elasto-plastic　deformation　ability,　stiffness　degradation　and　energy　dissipation　capacity.　The　test　results　show　that　the　measure　of　the　confinement　with　reinforced　frame　can　improve　the　seismic　behavior　of　concrete　core　wall　effectively.