Abstract: To study the performance of centrifugal concrete-filled steel tubes under bending and torsion,a real-size experiment on 11 tub es is done.The relevant operating method including equipment,subjects and proces ses is introduced.On different loading paths,the main factors that effect deform ation and stiffness and mechanism of break are studied.The experimental stress a nalysis shows that values of practical critical stress of the steel tube corresp ond well with Mises Yielding Rule.Finally,a correlate equation of bearing capaci ty of this structure under bending and torsion is deduced,which may provide a ba sis for design of such structures.