The requirement of GISs' data management demands a universal organization model instead of the conventional spatial and attribute departed data management model. The OODB organization technique is far from mature. Under this condition

a research on how to manage the attribute and spatial data in a universal way in theRDB was conducted. The organization of the spatial database is illustrated in four parts: the total database level table used to maintain the whole spatial data; the atlas table used to maintain the layers' information in a project; the map table used to maintain the layer information; the spatial index table used to store the spatial index information among a layer. The storage process of spatial data is illustrated through spatial data storage and spatial data calculation. A Geographical Relational Database Model was constructed and implemented in WebGIS.