Abstract:Our country has arisen the phenomenon of power failures in off-season. The phenomenon of energy-theft is increased power supplies. So Intelligent Anti-Tampering System becomes especially important. The in-depth analysis of the IEC101 protocol is particularly important for the application of Intelligent Anti-Tampering System, which guaranteeing the safe operation of the grid. Intelligent Anti-Tampering System communicate with teminal which using 101 protocol.Background monitoring by real-time curve chart update, automatic storage, real-time alarm to monitoring purposes.Stable performance is good, in the China Electric Power Research Institute testing, the indicators have reached the standard requirements.