FPC is made from a flexible substrate such as polyimide or polyester film. It has the advantages of high wiring density, light weight, thin thickness, flexible and high flexibility, and can withstand millions of dynamic bending without damaging the wire. According to the spatial layout requirements of arbitrary movement and expansion, to realize three-dimensional assembly and achieve the effect of integration of component assembly and wire connection, which will be with other types of circuit board incomparable advantages. So FPC is widely used in mobile phones, computers and LCD screen, CD walkman and disk player and other products.