A holding dock for portable computers to house a portable computer and disperse heat includes an upper lid, a holding surface, sidewalls and a hub to form a heat dissipation space. Heated air generated by the computer may enter the heat dissipation space through a heat dissipation section formed on the holding surface. The hub has a fan mounted thereon to draw the heated air to provide heat dissipation effect for the portable computer. The hub further can connect other electronic devices to the portable computer. The heat dissipation space can also house the portable computer to facilitate carrying and storing.