On the basis of stub-column test of concrete filled steel tube(CFT) and calculation of steel tube stress, the equation of confined concrete strength of CFT column is derived. This equation is a simple function expressed only by the strength ratio of steel tube to filled concrete. By the use of the equation of confined concrete strength the method to predict the ultimate bending strength of CFT column is proposed. The proposed method is the generalized superposed strength method in which the concrete strength is defined by the confined concrete strength and the steel tube strength is decided according to the calculated stress distribution. This method can predict well the maximum bending strength of CFT column test even if CFT column is the super-high strength concrete filled steel tube.