Abstract: Elastic-plasticity analysis about composite column with concrete-filled steel tube bearing earthquake action E1 and E2 is carried out.The results are compared with the ordinary reinforced concrete column which isn’t adapted to use because of super limit baffling water according to the objective need about the project.The ultimate bearing capacity and ductility function are superior to theirs of reinforced concrete pier.The conclusion can be referenced for the design of similar bridge under the a..