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At present, wreath net power supply has good economic performance and high reliability in the distribution network. The Wreath Net Cabinet is one of the main equipments of the wreath net power supply, and now has been applied extensively. So its safe operation is one of the key factors to guarantee Distribution Network's safety and reliability. This paper combines the hardware collecting the device, the GPRS wireless communication modem and the relative communication protocol, and the self-designed on-line monitor software to monitor the Wreath Net Cabinet. So it can carry on the on-line supervision to the temperature and current, and achieve to these functions, such as: remote measurement, remote signaling and remote control etc..