Abstract: Integrating two kinds of methods: GML driven visualization method and cartog-raphic representation based on GIS,a new cartographic representation model based on XML is presented.A self-defined markup language based on XML,which is named MapMML and describes the cartographic representation is introduced.In the portrayal,MapMML can be generated by transforming GML with XSLT,and symbolized into SVG map finally.At the same time,the MapMML data may store the modification of the SVG map.