Abstract: With the continuous development of the construction industry towards modernization, the number of intelligent buildings is increasing day by day, and people are increasingly inclined to use intelligent buildings. In the intelligent building, the design of the electrical automation system is the key. Because the electrical automation system contains a lot of content, the coordination between the various subsystems needs to be considered in the design process, so that the various functional modules of the electrical automation system can meet the requirements of the intelligent building. Usage requirements. Based on this, this article starts from the basic concept of intelligent buildings and explores the design requirements and applications of electrical automation systems. This is of great significance for guiding the design of actual intelligent buildings and guarantees the reliability of electrical automation systems.