Abstract: Soil nutrients map is a key issue to evaluate the soil fertility of field and plan fertilization regions. In tradition, soil nutrients map was made manually in the cartography procedures with low efficiency and heavy workload. It's a practice to automatic cartography in tobacco fields of Guangdong province using the GIS tools, spatial interpolation and powerful analysis of GIS data and mapping functions were involved. General approach for automatically cartography was put forward, and some key techniques were discussed.