We start from the hypothesis that spatial dynamics and geographical object usage evolution may be in part caused by the different previous evolution and the spatial configuration in which they are situated. Therefore, in order to analyze and understand changes in the geographical object functions over time, and to build a prospective then predictif model, we introduce the SAFFIET system. It exploits data mining (through the search of frequent itemsets and association rules) for extracting evolution rules that are guiding spatial dynamics.