Purpose: The purpose of this study was to design a biorhythm management model for Iranian public school principals with a fuzzy Delphi approach. Methodology: The design of the present study was qualitative with fuzzy Delphi method. Statistical population, professors of organizational behavior management in universities of Mazandaran province and senior managers of education departments in cities of Mazandaran province were selected and four rounds of fuzzy Delphi technique were performed with their cooperation. This selection and interviewing continued until the theoretical saturation was reached. Using the "rich information" sampling method with 15 professors of organizational behavior management in the universities of Mazandaran province and senior managers of education departments in the cities of Mazandaran province, the required information with semi-structured questionnaires Collected in four rounds. SPSS software was used to analyze the data. Findings: The results showed that the biorhythm management model of Iranian public school principals has four cycles and 28 dimensions of physical cycle (physical) (high mobility and energy, high physical strength, physical endurance and stability, physical weakness (negative), decreased physical ability (negative), inactivity and lethargy (negative), doing useful work and extreme fatigue (negative) ), Emotional cycle (interest in work and life, kindness, immorality and temper (negative), irritability (negative), confusion and mental weakness (negative), love of others, the power of creativity in affairs and mobility in Against the behavior of others (negative), intellectual cycle (mental) (rational) (promotion of intelligence, comprehension and memory, forgetfulness (negative), mental laziness (negative), poor decision-making power (negative), thinking power in affairs , Gaining new ideas and not focusing on personal and work affairs (negative) and intuitive cycle (inner inspiration, strong sixth sense, absorbing negative energy (negative) and attracting the spiritual forces of nature). Conclusion: Investigating the effect of biorhythm and different situations of employees on their job performance is an important issue and should be considered to prevent problems and increase performance, so identifying the explanatory dimensions of biorhythm management among managers of educational organizations, according to their critical tasks, is very important. And it seems necessary
