HDI is the English abbreviation of High Density Interconnector, High Density Interconnection (HDl) manufacturing is a printed circuit board, a printed circuit board is a structural element formed by insulating materials supplemented by conductor wiring. When the printed circuit board is made into the final product, integrated circuits, transistors, diodes, passive components (such as: resistors, capacitors, connectors, etc.) and various other electronic parts are mounted on it. Through the connection of wires, electronic signal connections and due functions can be formed. Therefore, the printed circuit board is a platform that provides component connection, and is used to undertake the substrate for connecting parts.