Abstract: Technology empowers modern architecture and promotes its intelligence and green development. However, as an emerging field, the design of building electrical and intelligent systems is not yet mature and standardized. This article briefly introduces the concept, characteristics, advantages, and development direction of building electrical and intelligent systems. Based on the analysis of design goals and requirements, the design principles of building electrical and intelligent systems are proposed, and typical intelligent systems and system integration design, equipment and material selection points are discussed and summarized. At the same time,two specific cases are analyzed and explained. The purpose of this paper is to provide reference for similar project design, effectively solve the practical problems of the project by improving the design service ability and work efficiency, boost the progress of project operations management level, and improve the construction quality.