SiP(System in Package) has become the continuation of post Moore’s law, The main technical route is an important support for the future miniaturization and multi-function of electronic equipment. It has a wide application market and development prospect in the field of micro and nano electronic design and manufacturing. This paper introduces the development and application of SiP technology. According to the development requirements of radar signal processing system chip based, integration, high energy efficiency and high reliability, it discusses the feasibility of applying SiP technology in radar signal processing system, and puts forward the design and implementation of a radar signal processing micro system based on SiP technology, which is more than 60% smaller than the area of PCB.