Abstract: A new type of RC composite core walls with steel tube-reinforced concrete columns and concealed steel truss was proposed.In order to know the seismic performance of this composite core walls,two 1/6 prototypal scale perforated RC core walls specimens were designed,one of them was composite core walls with steel tube-reinforced concrete columns,the other one was composite core walls with steel tube-reinforced concrete columns and concealed steel truss,and experimental study on seismic behavior of them under the cyclic loading was carried out.Based on the experiment,the hysteretic behavior,load-carrying capacity,ductility,stiffness attenuation,energy dissipation and failure mode were contrastively discussed.The test results show that the seismic performance of RC core walls with steel tube-reinforced concrete columns is greatly improved by the concealed steel truss.Finally,the mechanical model for calculating load-carrying capacity of the new type of RC composite core walls was proposed,and the calculating results agreed well with the suitable test results.