Building electrical engineering is a science that uses electric energy, electrical equipment and electrical technology to create, maintain and improve limited space and environment. It is a comprehensive subject between civil engineering and electrical engineering. After years of development, it has established its own complete theoretical and technical system and developed into an independent discipline. China Institute of Electrical Engineering has established a professional committee for industrial and building electrical applications, and the publication is Electrical Engineering Applications. China Architectural Society has a branch of Building Electricity, and its publication is Building Electricity. Building electrical engineering has been listed as a new professional direction in the new professional catalogue of higher vocational education issued by the Ministry of Education in 2000. The ultimate goal of building electrical engineering is to optimize and combine all kinds of hardware and software resources to become a complete system that can meet the needs of users. It organically combines all separated devices and their functional information used in various related networks of building automation, integrated wiring and computer systems into a related and unified whole. The development of architecture in the future. If we take "people (residents, relevant external personnel)-machines (buildings, various facilities and equipment)-environment (natural environment, artificial environment)" as a whole, it should be an unprecedented integration and complementarity of "humanized design-intelligent equipment-ecological environment", rather than mutual constraints, and it is a large-scale system engineering.