Sustainable urban development in the postmodern era has various aspects, but emphasis has been placed on its environmental aspect. Ecological approaches are mainly proposed with the aim of protecting natural resources and reconciling modern humans with nature in urban space. The city of Karaj has faced conditions where obstacles and issues have hindered its development path due to very significant changes within a limited time frame. This city, on the one hand, due to its specific geographical location, namely its position on the main highway of the western region of the country and its proximity to Tehran, as well as its extraordinary environmental potentials and having factories and industrial zones, has gained special importance in the regional development process. The main aim of this research is to identify strengths and weaknesses and to present a strategic proposal for the revival of the environmental structure of the city of Karaj. The research method, in terms of purpose, is practical, and in terms of method and nature, is descriptive-analytical. Data collection was conducted through library documents, observations, questionnaires, and the opinions of relevant experts and managers. Additionally, to determine the sample size and number of questionnaires needed, Cochran’s statistical formula was used. For prioritizing the strategies obtained using the TOPSIS method combined with the BOT model, Excel software was used. The results show that in the city of Karaj, water and soil pollution are less than the average, but air and noise pollution, with the respective rates of 2.756 and 2.465 percent, have the highest impact. According to the findings, it was clarified that the rapid process of urbanization and the extensive influx of migrants have led to physical development, destruction, and loss of gardens and agricultural lands