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Objective (s): This study aimed to assess the effectiveness of an educational intervention on health promoting behaviors to improve and quality of life among health volunteers. Methods: This experimental study conducted on 200 health volunteers of health centers in Tehran, Iran. The intervention included six educational sessions each lasting for 30-45 minutes. Follow up assessment performed six month later. Study instruments included the Health-promoting Behaviors (HPLP-II), Quality of life (SF-36) and a designed questionnaire based on the BAZNEF constructs. Results: The findings revealed that, before intervention, there were no significant differences in demographics, and health-promoting behaviors between two groups (p>0.05). After the intervention, mean scores of the BASNEF model constructs, health-promoting behaviors, and quality of life (except for role emotional and mental health) increased significantly in the intervention group (p<0,001). Conclusion: The study results revealed that the BASNEF-based intervention was effective in improving health promoting behaviors and quality of life among health volunteers.