This study aimed to investigate the factors affecting the sustainable management of agricultural water resources by the users of the Tajan River in Sari Township using a descriptive-correlational method. The statistical population of this study is the agricultural users of the Tajan River in Sari Township. The number of agricultural users in this Township is 42,850 people and the area of agricultural land covered by the Tajan irrigation network is 55,300 hectares. To determine the sample size, the Mendenhall et al. (1970) formula was used, which estimated the sample size to be 247 people, and to increase the accuracy of the study, 260 questionnaires were completed. Multi-stage stratified random sampling method was used to select the study sample. The data collection instrument was a questionnaire, its validity was confirmed by agricultural extension and education professors of Sari Agricultural Sciences and Natural Resources University and experts from the Mazandaran Regional Water Company, and Cronbach's alpha coefficients (0.75 to 0.84) indicated appropriate reliability of the research scales. Based on the results, the sustainable water resources management behavior index of farmers in three dimensions (agronomic, technical-technological, and participatory-social), was higher than average (2.9 out of 4). The results of the multiple regression test revealed that the three variables: educational services received by farmers, social capital, and environmental attitude had the highest impact on the sustainable water resources management behavior of farmers, and in total, these three variables explained 48.6 percent of the changes in the dependent variable. Considering the importance of educational services received by farmers for sustainable water management, more attention should be paid to the agricultural extension and education department in the Agricultural Jahad Organization, which is directly responsible for providing education to farmers, and the importance of work in this field should be understood