Abstract: Land spatial data organization and expression method was studied in order to realize the on-line land spatial data shares and enhance the land spatial data on-line transmission speed. The characteristics of the land spatial data and the customer's need were analyzed, moreover the data delaminating expression and the data format aspect were studied, through experiment one set of objective data was obtained. After contrasting and analyzing the data and the map, the data storage format according to user′s need should be chosen. When the user only browses the map but does not need alternately to operate it, the .JPG format or the .GIF format is recommended to use to store graphic document. When the interactive operation graphic document for the user is needed, the .TAB format of the MapInfo or the .SHP format of the ESRI is recommended to use to store graphic document.