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Aiming at the waste of electric energy and reducing energy consumption in university, a centralized, network and intelligent monitoring system for the electrical devices in the classrooms in the teaching buildings of schools is designed in combination with the Internet of Things and various data transmission technologies. As the automatic control centre of the system, the monitor gateway can do intelligent judgments with the data sent from the terminal sensing unit concerning illumination intensity, temperature, activity of students and switch states of every electrical devices in all classrooms. Meanwhile, using the Browser/Server and Client/Server mode, the monitor gateway connected with campus network can act as server,and the operator can view the working states of every electrical devices and control the switch of every electrical devices, windows and doors in all classrooms in real time by the Windows client, Android client and Web browser. Not only can the electrical devices in one classroom in the teaching buildings of schools be controlled remotely with human intervention,but also can be controlled automatically and intelligently with the light intensity, temperature and human activity of this classroom by this system. Practical tests show that the system has good reliability and stability, greatly reducing the campus waste of energy.