Heat dissipation apparatus for expansion base

A heat dissipation apparatus, comprising:

• an expansion base defining an air inlet slot at one side of the expansion base and a first inserting slot and a second inserting slot at a top of the base body;
• an air duct inserted in the first inserting slot;
• the air duct defines a first air inlet opening at a bottom of the air duct and a plurality of air outlet slots defined diagonally across a top of the air duct;
• a fan fixed in the air duct;
• a second air inlet opening and a second air outlet opening are defined in the fan;
• and
• a portable device configured to be inserted in the second inserting slot;
• wherein a first airflow passage is defined between the air inlet slot, the second air inlet opening, the fan, the second air outlet opening, the first air inlet opening, the air duct, and the plurality of air outlet slots;
• the fan is adapted to generate airflow through the portable device in such a manner that airflow flows from the expansion base outside is sucked into and blown out of the air duct via the first airflow passage.