This paper introduces the Internet of Things (IoT) technology into building energy-saving design as a novel idea, and considers how to make the new technology play a greater role in building energy saving in campus. The system architecture scheme was introduced to the essential and critical layer of the IoT operating mechanism, called energy sub-metering system and intelligent equipment control system, to realize the intelligent optimization for the management system and the physical environment in college building group. This paper also makes building energy conservation programs with long-term vision in order to avoid the cost increases that caused by the pursuit of high-tech equipment deployment blindly, and then put forward the innovative design against to the building group and the separate area of one building. The conclusion is obviously that the new IoT technology will lead a new direction for building energy saving design that greatly increase the spatial multiplexing possibilities and flexibility, and improve the efficiency of the unit area as well.