Abstract:Line loss rate is an important index of comprehensive management level for power supply companies,but electricity stealing happens frequently,which directly influences the economic benefits of power supply companies. On the platform of electric energy data acquisition system which is built with effort by State Grid Corporation of China,the measurement characteristics of data acquisition terminal of special transformer is used,and the electricity stealing analysis and daily monitoring are carried out through the comparison of multi - day power consumption of metering loop and measurement circuit,thus a good prevention mechanism is formed finally.