A lot of research has been carried out on soil and water conversion in the loess plateau. This resulted in the accumulation of a large quantity of spatial data. Improved management of these data well is becoming essential. Based on 1∶500 000 scale thematic data in the loess plateau, a method and process for building a database using the Librarian model of ARC/INFO is introduced. This database can be used to extract, query and display the spatial data. At the same time, the metadata of database is described.