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Qazvin Plain Irrigation Network (QPIN) is one of the first modern irrigation networks constructed in Iran and supplies irrigation water for about 60,000 ha of agricultural area. QPIN is a conjunctive type network with about 28 percent of surface water from Taleghan Dam and remaining supplies from groundwater resources. Groundwater quality is decreasing from over exploitation and it is expected that soil is being salinized gradually. In this research, soil salinity change was detected using satellite images as well as measurement and analysis of soil extract electrical conductivity (ECe). Landsat-TM/ETM+ images of the years 1999 and 2004 were used with more than 130 ground control points of salinity analysis. Relationships between ECe and image bands were investigated. The results showed that soil salinity class varied by an average of about 3 percent on the farmlands under QPIN during these 5 years.