Based　on　the　theoretical　model　of　the　load-deformation　relation　of　rectangular　concrete-filled　steel　tube　members,　parametric　analysis　was　performed　on　the　behaviors　of　moment　versus　curvature　response　and　lateral　load　versus　lateral　displacement　relationship.　The　characteristic　parameters　include　steel　ratio,　strength　of　materials,　axial　compression　ratio,　slenderness　ratio　and　depth-to-width　ratio.　Finally,　simplified　hysteretic　models　for　the　moment　versus　curvature　response　and　the　lateral　load　versus　lateral　displacement　relationship　were　suggested,　the　calculating　results　show　good　agreement　with　the　theoretical　results.　The　proposed　model　can　be　applied　to　the　seismic　analysis　and　the　design　of　rectangular　concrete-filled　steel　tube　structures.