Ultimate capacity and displacement of each specimen on the column are summarized in Table 2. Compared J0 with J4, capacity of the joint reinforced by BFRP increases limitedly, but the displacement increases significantly. Compared J1 with J4, the pre-damaged displacement has little effect on the ultimate capacity of concrete structure but has great effect on ultimate displacement. Compared J2 with J3, epoxy injection has little effect on both the ultimate capacity and displacement. The fact that the ductility coefficient without reinforcement is less than that with reinforcement shows BFRP can increase the seismic performance abundantly.