Abstract: The drawing of topographical map is one of the basic works in practical production activity on agricultural engineering field. The traditional map-making needs a great deal of handicraft homework, and its efficiency is low. Based on the VBA(Visual Basic for Application) code, the extended application of AutoCAD software on map-drawing was developed and designed, which realized the automatic input of landform data and the drawing of topographic map. Combining an engineering example, the method and process to develop an extended application of AutoCAD with an inserted VBA code was discussed and illustrated. The operating result of the designed procedure indicats that the memory space occupied is small, the automatic degree and work efficiency for map-making are high, and its applicable scope is wide. The designed procedure can complete the drawing of topographic points automatically, and hence establishes a foundation for the making of topographic map.