Numerical　method　is　used　to　analyze　the　moment-curvature　hysteretic　behaviors　of　concrete-filled　circular　steel　tubular　beam-columns　in　this　paper.　Influences　of　several　parameters,　such　as　axial　load　level,　steel　ratio　and　strength　of　the　materials　on　the　moment-curvature　hysteretic　curves　are　analyzed.　Finally,　based　on　the　results　of　parametric　analysis,　a　kind　of　moment-curvature　hysteretic　model　of　concrete-filled　steel　tubular　beam-columns　with　circular　sections　is　presented.