A manufacturing method of a structure of a thin fan includes providing a plastic material containing a plurality of metal particles and forming a housing from the plastic material. A part surface of the housing is removed, and a layout area and an extended circuit are formed on the housing. One terminal of the extended circuit connects to the layout area. A first signal connecting structure is disposed on the housing. The first signal connecting structure connects to the other terminal of the extended circuit. A metal layer is disposed on the layout area and the extended circuit.