The present research has conducted with the aim of studying the process of changes and transformation of agricultural lands in Shahriar county in the last 30 years using Remote Sensing technology (RS) and Geographic Information Systems (GIS) and the causes of agricultural activities reduction and providing solutions and policies for the promotion and development of agricultural activities. In this research, for information analysis and preparing agricultural land use maps, Landsat satellite images and sensors (TM-ETM-TIRS) were used in the years of 1989 to 2022 (4 periods) along with thermal remote sensing and GIS techniques. The results showed that garden lands have decreased a lot in the last 30 years, and irrigated agricultural lands have increased, and the analysis of vegetation using the NDVI index showed that the vegetation during the study years has been decreased. Moreover, the climate change pattern showed decrease in rainfall and increase in the surface temperature of agricultural lands in the last 30 years which has faced the farmers with water shortage and reduction and unwillingness to do agricultural activities. According to the findings, it is evident that the trend of climate change, such as increasing temperature and decreasing rainfall, and agricultural land changes, have become a serious and concerning problem in this county, and it requires the implementation and presentation of new solutions and policies in order to develop and promote agricultural activities.