Abstract: The determination of quantity of variable rate fertilizing plays a very important role in the planting of high-quality wheat, which can be made according to spatial variability of soil nutrition and growth characteristic of wheat. This paper deals with the research of wheat variable rate fertilizing information system. The system resolves the problem of the doubt to soil nutrition supply through considering well the spatial variability of it in fertilizing recommendation using Kriging method in GIS. The recommendation of fertilizing quality is made using Postponing Nitrogen technique with mathematics model on the basis of diagnoses in line of professional knowledge database and thinking about soil types and soil barrier layers, etc.