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Taking grid system as the basic of land management, this paper focused on the establishment of county land and resources management information system based on grid system. Presentation layer, application layer and data layer were proposed to construct the frame of county land and resources management information system. After the principles of grid dividing been clear, methods and thoughts based on three-level land grid were explained in detail. And the mechanisms and processes of county land data were discussed in detail. Finally, combined with the actual design in Shapingba of Chongqing, the prototype of county land grid management information system was realized. The results provide guidance and reference for other county in land management information system.