Intelligent building is a new type of architecture concept, which is developed with the widely use of computer technology, communication technology and web technology. Intelligent building not only pursues the beauty and the stability of the structure, but also pays more attention to the management and control of the building by various advanced technologies. Based on NARI RT21 Integrated monitoring platform, this paper realizes the centralized monitoring of multiple subsystems such as the building automation, security and protection, fire control, energy collection and so on. Through the intelligent linkage between the subsystems, the cost of building integrated management can be reduced.