| As a result of the development of information technology , cartography has undergone a radical innovation. Digital, automatic and intelligent means become the main means in surveying production, and the basic surveying work has transferred from producing single analogous map to producing basic geographic information products.4D presents Digital Raster Graphic, Digital Line Graphic, Digital Elevation Model and Digital Orthophoto Map. As the main form of National Spatial Data Infrastructure, 4D is widely used in many national economic fields in place of traditional maps. Accordingly the problems of their qualities attract more and more attention .In this paper, such problems as what is 4D and their characteristics, how to make 4D, and the essence and attribute of quality, are analysed firsto Then base on the foundation of fuzzy mathematics, the model of fuzzy comprehensive assessment for 4D was based , and a example was given to make a comparison between fuzzy comprehensive assessment method and conventional one. At last, some shortcomings and suggestion on this research are concluded.
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