Based on the technology of MCU control, a device, which could prevent stealing electricity power of power distributing box, had been designed in this thesis.

If it is necessary, the power consumption inspector may collect the related evidence according to law by videotaping, taking photos, keeping the device of electric larceny on the scene, etc.

An intelligent electricity-filch monitoring device based on power line transmission technology is introduced, which consists of monitoring unit, CPU, power line transceiver and so on.