Today, factors such as population growth, rising health levels, and the development of the industry, along with climate change and reduce precipitation, have shaken the relative balance between water supply and demand, leading to a challenge called the water crisis. In this case, water resource management, as the most important tool for overcoming the water crisis, is more and more to be addressed. Today, due to absence of possible potential in the development of new water resources, the need to change the approach in water resources management is inevitable, and it is necessary to pay attention to water demand management along with supply management. Therefore, this study examines the implementation of water demand management in the Zayanderud basin and attempts to introduce effective and practical measures in different sectors, and compare them with each other and identify the best in different sub-basins based on effective criteria in decision making. In this study, four actions included increase the water use efficiency of the agricultural sector through the use of pressured irrigation systems, the use of drinking water reduction equipment, reuse of urban waste water treated in the agricultural sector and water recycled in industries was identified and in terms of criteria such as reduced water use, cost of implementation, consumer profit and positive environmental impacts, were studied in different sub basins of Zayanderud basin. In the next step, taking into account goals such as maximizing water consumption reduction (quantitative conservation), minimizing the cost of implementation, maximizing consumer profits and maximizing the quality protection of water resources through the implementation of demand management, Multi-objective optimization of water demand management was done through Goal Programing. The results of this study indicate that the maximum potential for reducing consumption due to the implementation of these four measures in the basin is about 360 million cubic meters per year, which is 220 million cubic meters of that contribution to increasing the irrigation efficiency in the agricultural sector. It should be noted that the achievement of this level of reduction of water consumption requires costing more than 4,500 billion Rials per year, and it is very time
