(The CASS cadastral mapping software in the south is a digital surveying and mapping data acquisition system based on the secondary development of AutoCAD, while the urban cadastral management system widely uses ArcGis to manage spatial vector data; other terrain and cadastral attribute data need to be imported into ArcGis without loss. Contact the construction of 1:500 urban cadastral database in Nanxian County, and analyze the method of using Nanbian CASS software for data management in the construction of cadastral database.)