Phase 1: Early stages of embedding technology. The embedded system exists in the form of programmable controller with simple function, special computer or single chip microcomputer as the core. It has the functions of monitoring, servo, equipment indication and so on. This system is mostly used in various industrial control and aircraft, missiles and other weapons and equipment.

Phase 2: marked by high-end embedded CPU and embedded operating system. The main feature of this stage system is the emergence of high reliability and low power embedded CPU in the computer hardware, such as ARM, PowerPC, etc., and support the operating system, support the development and operation of complex applications.

Phase 3: marked by chip technology and Internet technology. With the rapid development of microelectronic technology, SOC (system on chip) makes embedded systems smaller and smaller, but more powerful. At present, most embedded systems are isolated from the Internet, but with the development of Internet and the combination of Internet technology with information home appliances and industrial control technology, embedded technology is entering a period of rapid development and wide application.