Abstract: In GIS,graphic editing is an important link in data capturing,updating and outputing.In this thesis,the principle and method of graphic editing,and the structure and function of MDBGES based on map database are stated,and the result of the tests is analysed.The project on the establishment and classfication of program library and the prototype of a set of functions interfacing with map database are put forward according to the relation of user application programs with DBMS.A useful exploration has been made in making a standard for the interface Of user with DBMS.Two propositions on symbol graphic editing are discussed.