Desertification is the permanent loss of soil fertility due to ecological turbulences and mismanagement which is happening at large scales in different climates around the world. In this study, MEDALUS model was used for evaluating desertification status and assessing the performance and quality of surface soil in Najafabad county. Climate, canopy cover, soil, ground water, hydraulic erosion, wind erosion, management and policies were selected as main desertification evaluation criteria based on previous studies and field works. For each of the main criteria, most important indicators were described and weighted. Geometric mean of the criteria were then calculated using ArcGIS software and mapped. The geometric mean of the criteria were calculated and desertification maps were produced. According to the results, the study sites categorized into two main dir=ltr Keywords: desertification, MEDALUS model, rangeland function, landscape functional analysis, compromising management
