摘要：This paper discusses the urban land grading system based on the self_developed GIS *** system establishes the system template,the relevant data structure and the empirical formulas of the affecting factor and economic data of land ***,the system can calculate the service radius,sum and land grade ***,it can do statistics and query on various land information and show the result of land grading with spatial and attribute *** paper illustrates the result by giving an example of the commercial land grading of the urban area of wuhan City by the urban land grading system.