The performance failure of electricity meter and power line fault can lead to abnormal data statistics, and the accuracy of data directly affects the vital interests of power departments and users.The fault diagnosis scheme can detect these faults quickly and accurately, thus improving the accuracy of data statistics.Field intelligent watt-hour meter fault diagnosis scheme is mainly of watt-hour meter communication, fast access to the data of watt-hour meter and analysing the data, so as to judge the watt-hour meter and the line of common failures.According to the severity of the fault can be divided into three categories, each kind of fault for the corresponding routing process, and test data in the database, can export analysis and check at any time.At the same time, the fault information and data are uploaded to the metering marketing management system.Finally, the practicability of this scheme is verified through the actual case of a city in dalian city.In order to provide some reference for the accuracy of data statistics.