Research on important process technology of SiP (System-in-Package) solution of mobile terminal electronic products: mainly engaged in FFS (Full Function) of mobile terminal electronic products (including but not limited to smart watches, TWS headsets, VR/AR, drones, etc.). System-in-Package, also known as All-in-One SiP), SoF (System-on-Flex) and FMS (Function Module System-in-Package) important packaging process technology research.