Many　frame　structures　were　damaged　for　the　column　hinge　mechanism　in　the　Wenchuan　earthquake　because　of　the　biaxial　seismic　action.　Four　reinforced　concrete　columns　with　corner　focus　longitudinal　bars　were　tested　to　improve　the　seismic　behavior　of　RC　columns　subjected.　to　multiaxial　loading.　The　hysteretic　behavior,　skeleton　curves　and　feature　points　were　discussed.　The　results　indicate　that　the　method　can　improve　seismic　behavior　of　RC　columns.