A heat dissipation assembly includes a heat sink and a fan. The heat sink
device has a base and a plurality of fins formed on the base, the fins
are parallel with each other, one or more of the fins cooperatively form
at least two concave engagement parts. The fan has at least two elastic
arms extending from middle positions of two opposite sides of the fan, an
engagement hook is formed at an end of the at least two arms. The at
least two engagement hooks are engagable with the at least two engagement
parts, for fastening the fan on the heat sink device.