Abstract:Transformation between AutoCAD datas and MapGIS datas in geological maps is analysed in this paper.Four aspects are analysed relatively,such as: transformation of DXF form,transformation of relative strata of DXF form,documents transformation after deleting relative datas of AutoCAD map,and only adopting part of AutoCAD document.Some problems occurred in transformation period are analysed as well,which will solute some techniques in transforming AutoCAD data documents to MapGIS data documents.