With the rapid development of Chinese construction industry, the intelligent building gradually entered people's life. In this paper, the intelligent building management system is designed, and its core function is to connect other subsystem or equipment to provide comprehensive access function and joint function. Intelligent building not only pursues pretty outline and stabilization, but also seeks to apply computer network, communication network and automation technology to make intelligent building safer and more comfortable. The major task of intelligent building’s system integration is to establish the Intelligent Building Management System. Through the design of this system, it can achieve to integrate hardware devices and other systems conveniently, and it also can coordinate with each object which access to this system for the effective operation. Intelligent Buildings are sustainable buildings that result from the application in buildings of IT based on computer technology, and have capacities of friendliness with people and harmony with nature.