A balance valve is provided with an asymmetric structure. When the dual-temperature ceramic valve is switched to cold water supply modes, and the hot water line is blocked to make a moveable spool abutted towards a first lateral end wall of a holding space, a cold water channel can thus be formed between the cold water opening of a fixed valve pipe and a second end of the moveable spool with the setting of the asymmetric structure. Hence, cold water supply can maintained. When the hot water line is blocked, the cold water supply function of the balance valve of the present invention could still be maintained for improved convenience and applicability.