The intra-plate, Plio-Quaternary Sabalan volcano in the NW of Iran is considered a strato-volcano. It has a particular importance in terms of geological setting and geothermal potential. Deformation of the volcano may has been caused by tectonic, magmatic or gravitational factors. It has been detected by time series analysis of observed displacements with InSAR. In this research 20 images of the ENVISAT satellite are used in a period of time from 2003 to 2010. Also for analyzing time series, the shortest base line method were used with STAMPS soft pack and finally, the map of the average speed caused by the surface changes of the Sabalan volcano and its surrounding area has been obtained and interpreted. The caldera in the Sabalan volcano indicates a maximum subsidence rate of about 3 millimeters per year in last 0.5 million years. Also, the East-West trending Ahar-Varzaghan fault indicate a major right lateral component.