A heat exchanger is connected with a heat source in order to dissipate heat generated by the heat source. The fastening apparatus includes a first bracket and a second bracket, both connected to the base, and a first latch element. There is a first opening formed in the first bracket. The first latch element is connected to one side of the heat exchanger, and includes a first protrusion and a first contact section. The first protrusion penetrates through the first opening making the first bracket provide movement limitation to the heat exchanger. The second bracket provides additional movement limitation to the heat exchanger. To separate the heat exchanger from the base, the first contact section is pressed to make the first protrusion move out of the first opening.