Abstract: A radiator bonding to a heat source for transmitting thermal energy includes a conductive base board and a plurality of radiation fins. The conductive base board is in contact with the heat source to perform heat transfer. The radiation fins are mounted onto the conductive base board and are segmented into a first fin section and a second fin section that are spaced from each other at a selected distance to form an airflow space with a wider upper end and a narrower lower end. Airflow generated by a radiation air fan is directly channeled to the conductive base board to perform heat exchange.