In the article, the relationship between the soil taxa and the soil forming factors is analyzed and its model is established on the basis of research on soil taxonomy in the selected region, GuiYang, GuiZhou Province. RS and GIS is applied to enhance and income the message of the soil forming factors, which are calculated by the method of overlying vector,and finally the map of soil taxonomy is achieved through the way of the model of soil taxa and soil forming factors. According to validating in the field, on the basis of TM, the method can meet the requests from 1:100 000 scale soil map.