In practice, few intelligent buildings are really weak, and most of them just build some intelligent subsystems to realize simple integrated operation and information exchange of these subsystems. We believe that the starting point of weak current engineering design of intelligent buildings should be based on buildings, and various functional systems should be configured to provide people with reasonable, efficient, comfortable and convenient environmental space to meet the needs of modern buildings. From the specific design, we should start from the actual nature of intelligent building, fully consider the various functional needs of owners and users, make the design as modern as possible in the overall structure, advanced and practical in technology, and reasonable in economy, and at the same time consider the compatibility and expansibility of various systems of intelligent building.