This paper describes horizontal behavior of composite bridge column consisted of reinforced concrete and steel tubes. First, steel tube-concrete bond test is conducted for analytical model. Second, based on this model, 2D FE analysis is carried out to explain experimental test results of column scale model subjected to cyclic horizontal load. Third, with using this analytical program, numerical experiments are carried out to predict not only flexural but also shear behavior as well. Based on these numerical and experimental test results, followings are practically proposed; 1)horizontal loading and ductility capacity. 2)Takeda Model based hysteresis model for dynamic analysis, and 3)shear loading capacity taking high strength winding strand and steel tubes into account.