Abstract: This paper introduces the online diagnosis model of wrong wiring. The model relies on high-frequency collected voltage, current, active power, reactive power and other data. Besides,it is Combined with big data analysis technology. So the reform of on-site power outage check to online diagnosis is realized. However, in the process of calculating the wrong amount of electricity, two kinds of metering logic errors of electricity meters were found, the specific reasons for the wrong accumulation of total electric quantity and phase-divided electric quantity were confirmed through data calculation and laboratory testing. Finally, relying on the high-frequency curve data, the accrued electricity is accurately restored by integrating again.