The concept of "spatial entropy" developed by Michael Batty (1974) was primarily used to test different hypotheses concerning the distribution and density of population in great cities like New York, London, Los Angeles. Subsequently spatial entropy was adapted in urban and regional studies, where two types of research have been outlined: - "descriptive statistics" and "MaxEnt" method (Esmer 2005). Three characteristic elements related to the three components of sustainable development (society, economy and environment) have been considered to shape the degree of entropy for the urban system Marghita, namely: population, turnover and green spaces. The determination of the entropy degree for the Marghita urban system was achieved by ...