Through　theoretical　analysis　and　experiment　on　two　concrete-filled　steel　tubular　frame　structures　under　reversed　cyclic　loads,　which　have　the　same　shapes,　materials　and　dimensions,　seismic　behavior　of　the　concrete-filled　steel　tubular　frame　structures　are　studied,　Concrete-filled　steel　tubular　frames　have　more　merits　than　reinforced　concrete　frame　through　comparative　study　on　the　seismic　behavior,　and　are　worth　while　to　study　further.