Software system on distribution map generation of soil parameters was developed based on VC++. With the help of MapX control, soil spatial data could be edited, analyzed, generated distribution maps and so on. Soil parameter scatter graph was displayed and classified by equal count method, equal range method, natural break method and standard deviation method. In the software system soil parameter statistics data was also calculated and a new perimeter and area algorithm was developed. After comparison of different interpolation methods, Inverse Distance Weighted (IDW) method was selected to generate the soil parameter contour map and soil parameter iso-surface. At the same time the system gave the legend color and drawing method. These maps could also be saved as vector graphics. Finally a distribution map generation of soil parameters for soil moisture and total nitrogen was conducted by the soil samples from Xiangtang apple orchard in Beijing suburb, including scatter graph, contour map and iso-surface. The errors of perimeter and area were less than 3.72% and 3.01%, respectively. The result shows that the system has perfect function and stable performance.