Data quality has been the vital factor on which the reliability of the result of GIS analysis and application depends with the development of GIS. Based on the review of GIS database quality control recently research

a multi hierarchy conceptual model of data quality control is given in this paper. We can accomplish data quality control beginning with data source and then database proceeding

finally data using by this model

and then aiming at the characteristics of Marine Fishery GIS data

the detail structure of database quality control is schemed

at the same time several practical approaches of data quality control are discussed thoroughly. At last

based on the techniques of metadata and data warehouse

a prototype of intelligent data quality control is provided.