In order to study the earthquake resistant characteristics of anchor bars of seismic stopper, model tests were performed. The main findings were as follows: 1) the failure mode of anchor bars was not the shear failure of steel bars, but the tensile failure together with the bending failure; 2) the capacity of anchor bars decreased if the ratio between the superstructure-substructure-gap and the diameter of bars increased; 3) the size of gap inside sleeve pipe had little effects on the capacity; and 4) the tensile strength, not the yield strength, was the main factor affecting the capacity. Based on the above findings, the capacity evaluation method of anchor bars was proposed.