Modeling Deforestation using Spatial Data Mining Kamal Nematpoor Iran Email: knematpoor@yahoo.com Spatial data mining is a new and rapidly developing technique for analyzing geospatial data.one of the application predict spatial distribution of tropical deforestation.spot images dated 1987,1988,1991,1992,1995 were classified in order to generate digital deforestation and forest persistence areas.A multi-layer perceptron was trained in order to estimate the propensity to defrestationand as a function of the explanatory variables and was used to develop defrestation risk assessment maps.