Abstract: Based on tests, the influencing factors on the damage as shown in the topic were considered to ascertain the damage variable and damage model which is adaptable to the side joints of HSRC column/HRC beam under low cycle repeated load. The different phases of damage growth and their features were analyzed under the cyclic earthquake load, as well as the relation of damage to displacement. The result showed that the damage level of joints with increasing axial compression ratio, and the smaller the rate of stirrup used in core area is, the higher the damage level of joints rise but the ductility decreases slightly will be with ductility decreased slightly. On the contrary, the damage level of joints lowers but the ductility increases.