City data quality management method and system based on big data

The invention relates to the technical field of data quality management, in particular to a city data quality management method and system based on big data, and the method comprises the steps: arranging data call record information generated by each storage region in a smart city database in a process of applying each business decision management model constructed for a smart city; the same business decision management model is combed, and data difference changes based on data sets retrieved from the storage areas are evaluated for deviation distribution conditions among data retrieved from the storage areas in the smart city database in different historical application records; the degree of contribution to the situation that the corresponding business decision management model shows large application result deviation is further analyzed to obtain the data in each storage area and the importance degree value in the urban business decision process, so that the security level-to-level management of the storag