This study investigates nonlinear interface behaviors of concrete filled steel tubular column(CFT) dependent on various confinement pattern under axial load For the purpose of evaluating a confining effect of concrete, the 3D finite element analysis using ANSYS was performed The influence of parameters such as width-thickness ratios, strength of the concrete and the yield strength of the steel, was examined. The suggested evaluation procedure that assembled three parameters were compared with previous experimental results. The obtained results are summarized as follow. The average restriction stress by the restriction effectiveness of the concrete showed the tendency to be reduced as the width-thickness ratio of the steel pipe section increased. It was turned out as the thing by enduring the load bearing equipment much more as the width-thickness ratio small.