Printed Circuit Board refers to the insulating substrate in the selective processing of mounting holes, connecting wires and assembly of electronic components of the pad to achieve the electrical connection between the assembly board components. Printed circuit board is one of the most important components in electronic products. From home appliances, communications equipment, weapons and aerospace equipment, are inseparable from the printed circuit board. In the development of electronic products, PCB design, documentation and manufacturing are the main factors affecting the product success. A qualified Communication PCB is composed of pads, vias, mounting holes, positioning holes, printed wire, components surface, welding surface, etc with dual role of conductive lines and insulation floor base.