Introduction
Rangelands are considered as one of the most important and valuable national resources of the country, and their correct application along with their improvement and restoration processes can play an essential role in preserving water and soil and meeting the country's needs in the field of protein products. On the other hand, sustainable management of this natural resource is necessary to continuously consumption and maintenance intergenerational.
 
Methodology
Therefore, in this research, the sustainable management of rangelands in Sistan and Baluchestan province using the advanced fuzzy SAW technique has been examined from an economic-social point of view, which is one of the most widely used multi-criteria decision-making models and decision support system (DSS).  In real world decision making situations, the use of common multi-criteria decision-making methods can face severe practical limitations due to the criteria containing a set of incorrect information, as often in multi-criteria decision-making problems, the data are imprecise and fuzzy. Then, it is suggested to use the fuzzy criteria decision-making method. In the fuzzy SAW technique, the opinions of experts should be used in several stages to collect the required information. For this purpose, the relevant questionnaire was prepared based on the five criteria of economic sustainability, social sustainability, environmental sustainability, technical and operational sustainability, and extensional sustainability, and sub-criteria were extracted based on the opinion of relevant experts. Finally, by completing the questionnaire from 40 professional experts (in 2 categories of local people and professional experts) in the field of environment and rangeland, relevant information was collected. Also MCDMSOLVER software version 2018 was used for data analysis.
 
Finding
The results of the research show that among the five criteria examined; in the category of local people (Consumers), the option of "providing the ground for access of groups to government support credits" has been ranked first with a score of 13/543, which shows the importance of this issue. Also, the option of "encouraging the formation of local groups and cooperative processes for the expansion of rangeland" with a score of 12.012 is ranked second and the option "drafting appropriate standards and regulations for the use of rangelands" is ranked third with a score of 11.682 to be. On the other hand, the results obtained showed that the options of "environmental considerations such as soil water protection in order to maximize the output of the ecosystem", "drafting a strategic document for the extension and sustainable development of rangelands" and "taxing activities that consume a lot of resources and Pollutants in the field of rangelands" are in the last ranks of rangeland management from the point of view of local farmers. While according to the opinion of experts, among the 5 criteria, "environmental considerations such as soil water protection in order to maximize the output of the ecosystem" and "government and financial support in the implementation of resource-protecting and environment-friendly activities" the first priorities and the second is rangeland management.
 
Discussion and Conclusion
In general, considering that the economic and environmental components are the most important factors in the sustainable management of rangelands from the point of view of users and experts, therefore, support programs for users and improving their livelihoods, as well as establishing specific laws regarding the management and proper use of rangelands can be the way forward. In the meantime, it is suggested to use economic policy tools such as rangeland exploitation tax and protection measures from this God-given resource.