Sustained development is achieved an overlapping is created between ecological, economical and social classes. The purpose of this research is to determine and measure the sustainability criteria and indices. An ecological approach has used in order to assess sustainability in watershed of Zeidasht1 to maintain a balance between three economical, social and ecosystem categories. Selected variables were obtained using common assessment and their value. In order to assess sustainability, watershed and range management projects monitoring and evaluation monitoring provided by  president strategically supervising planning assistant and range and watershed management, forest organization(watershed management department, coordination and planning department) for Iran. As a whole, in rangeland ecological section, three criteria, nine indices and fourteen variables were evaluated. Final score for ecological one was 45 fall in to in moderate class and final score dedicated to social and economical issues about 32 that number of 2 is obtained in respect to 16 selective variables that also it categorized into moderate class. Eventually using matrices, score estimation and watershed validation table, watershed sustainability is determined. In respect to total Zeidasht watershed score, this watershed is categorized in too poor sustainability class.