Energy crisis promotes the development of more electric aircraft, and environmental control system is the high energy consumption system of aircraft. Therefore, electric environmental control system has become an important direction of aviation technology development. This paper introduces the composition of Boeing 787 environmental control system, discusses the architecture design and trade-off analysis of the environmental control system, and introduces the research status of the key technologies of the main components of the environmental control system of the more electric aircraft, so as to provide reference for the research and development of the domestic electric environmental control system.