Geomorphologic information database, which is mainly used to memorize and manage the map and geomorphic objects, is an important section of X-2000 high-speed 3D terrain display system. Like other graphic objects,map and geomorphic objects' attributive value has the property of unfixed length, hierarchy and multimedia. It is difficult to describe it with simple data type. On the basis of how to use traditional data model to describe and memorize complicate map and geomorphic objects, this paper makes use of commercial database manage system(ORACLE 5.1B), and full related structure to design and build the Geomorphologic Information Database.