To　investigate　the　effects　of　initial　stress　level　and　the　strength　of　self-compacting　concrete　(SCC)　on　seismic　behavior　of　columns,　six　concrete　columns　strengthen　with　SCC　and　two　comparative　columns　were　designed　for　low　cyclic　reversed　loading　tests.　The　initial　stress　level　is　0.35,　0.5　and　0.75　respectively.　Based　on　experimental　studies　on　the　failure　process　of　columns　and　the　stress-strain　relationships　of　concrete　and　hysteresis　curves　of　specimens,　the　co-operational　performance　of　new-old　concrete　was　presented.　The　bearing　capacity,　ductility　and　ductility　factor　decrease　with　the　increasing　of　initial　stress　level.