Accurate data and timely information regarding the existing land-uses is needed to manage the natural landscapes effectively. The information related to land-use changes constitutes the basic element in management of natural resources. In fact, the awareness about patterns of land-use changes is conductive of ecosystem toward balance. Therefore, the need to detect, plan and predict such changes in an ecosystem is of great importance. In order to discover these changes, the application of multi-temporal remote sensing data (RS) and geographical information system (GIS) provides the possibility of valuable analysis. In this paper, two images, i.e. ETM+ 2002 and OLI 2015 were used for Zanjan city. To map the pattern of changes, at first the coordinates of two images were integrated, andafter the atmospheric corrections, the considered area was classified to four classes including residential areas, road network, vegetation and other regions using the maximum likelihood method. Then,Post classification and overlapping methods were used to detect changes. The results show that the urban expansion has increased during 13 years. The expansion of Zanjan City has been inclined more toward north and north - west affecting the barren lands, while the garden lands in the south has been less influenced by urban expansion.