Abstract: With the rapid development of China's national economy and science and technology, it has played a great role in promoting the development of intelligent buildings. As an important part of intelligent building, the wide application of building automation system can not only improve the comprehensive performance of intelligent building, it can also improve the later use effect, it is of great significance to the development of intelligent buildings in China. Based on this, this paper analyzes the application of building automation system in intelligent building, in order to provide reference for related applications.