Rigid flex joint board is a product formed by local material stacking differences through processes such as pressing and opening, which has both FPC and PCB characteristics. It can improve the design flexibility of limited space and meet the complex requirements of welding and 3D assembly applications; With the development of technology, advanced products such as High Level Interconnect (HDI) are gradually being mass-produced. At present, rigid flex joint plates are widely used in high-end consumer electronics, intelligent terminals, displays, aerospace, military and other fields.