purpouse: The aim of this study was to improve the organizational vitality and environmental performance of the university by implementing green management in the administrative, educational and research units of the free universities of Mazandaran province in the academic year of 2019-20. Methodology: Method in terms of practical purpose and in terms of data collection among descriptive research was correlational and in terms of method was mixed exploratory research. The statistical population consisted of 21 experts, specialists, experts in the fields of educational management and psychology, which was done using purposive sampling method and using the principle of maximum diversity to achieve theoretical saturation using semi-structured interviews. For validity and validity of the data, two methods of reviewing participants and reviewing non-participating experts in the research were used. The statistical population in the quantitative part included all faculty members, senior, middle and operational managers and officials of administrative, educational and research units of free universities in Mazandaran province in 1950. In the quantitative part, 321 people were selected as a statistical sample by relative random sampling method based on Cochran's formula. Findings: Data in the qualitative part were extracted through the implementation of Delphi technique with a semi-structured questionnaire and in the quantitative part through the implementation of researcher-made questionnaires of green management, organizational vitality and environmental performance on the statistical sample. The validity of the questionnaires was confirmed in terms of content and structure. Reliability was estimated and confirmed by Cronbach's alpha coefficient with 87%. Used. Results: Exploratory and confirmatory factor analysis showed that green management (six dimensions) has an effect on organizational vitality (seven dimensions) and environmental performance (seven dimensions) and organizational vitality has an effect on environmental performance. Also, organizational vitality played a mediating role in the impact of green management on environmental performance. Discussion: The development of economy, industry and green innovation requires culture building and efforts of every committed and responsible citizen of the country and as a matter of governance, all elements of the system must adhere to it.
