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The Approach to transfer data format from CAD to GIS is researched. The method based on SuperMap, which is considered better by being analyzed the data format transformation method based ArcGIS, FME, GEOWAY and SuperMap, can maintain the geometric element integrality, support adding the attribute data of GIS, and support the data format of China GIS software. The method for data format transformation from CAD to GIS based on SuperMap is studied, while the study object is the CAD data of transport infrastructure provided from Jilin City. The application result shows that the method for data format transformation from CAD to GIS based on SuperMap can realize the data format transformation work better, such as the transformation of geometric elements, coordinate system conversion, layer alignment, layer topology processing and layer label.