Method for multiple assessments of land parcels on the base of fuzzy set theory integrated into geographic information systems (GIS) is developed. Numerical experiments for the application of the method in urban planning are carried out. Multiple assessments of land parcels in St.Petertsburg (Russia) suburbs is calculated and mapped. Complex evaluations of land parcels have been carried out by fuzzy model with the use of four criteria (technological, economical, ecological and social) for two special tasks: 1) ecological criterion is more important and 2) economical criterion is more significant. The results show the opportunity of the land parcels ranging for decision making support.