Experiment　research　for　aseismic　performance　of　RC　Column　strengthened　by　self-compacting　concrete　under　second　force　is　completed.　By　comparing　three　comparison　columns　and　three　columns　strengthened　by　self-compacting　concrete　in　low-cycle　reciprocating　horizontal　loads　seismic　performance　test,　the　specimen　described　the　typical　features　of　breakage,　and　the　hysteresis　and　ductility　of　the　RC　column　reinforced　or　not　by　self-compacting　concrete　is　analyzed,　the　reinforcement　effect　by　the　different　initial　force　is　compared.　The　results　show　that:　reinforcement　by　increasing　the　cross-section　of　self-compacting　concrete　is　an　effective　method　to　significantly　improve　the　shear　strength　of　reinforced　concrete　columns　and　specimen　ductility.　The　presence　of　the　initial　force　have　impact　on　reinforcing　effect　of　RC　columns,　the　greater　the　initial　force,　the　more　obvious　impact.