In order to meet the requirements of low voltage users on the power quality, the grid enterprise must analyze and diagnose the relevant power data and make the decision accordingly.In view of the importance of techology for data quality control on low-voltage user management, this paper first proposes a set of data quality control procedures for power grid enterprises, and uses several check-up algorithms to ensure rationality of data, including the correctness verification, uniqueness verification, integrity verification and accuracy verification.Problematic data has been amendeod in order to ensure the correctness of data analysis results, .Finally, a simulated example is given to verify application effects of data quality control technology.