Teenagers' autonomous fitness behavior is an important manifestation of teenagers' positive development,which can effectively promote their all-round and healthy development of physical,mental and social morality,and enhance their satisfaction with a better life. Fully considering the three-stage characteristics of the subject being constrained by the system,being promoted by the environment,and being independent and stable in the process of the cultivation and education of adolescents ' independent fitness behavior,the goal concept of comprehensive health and positive development is constructed,and the external environment coordination and individual "non-autonomy--autonomy" spiral promotion are taken as the content system. The combination of school-wide and full-staff,systematic and scientific,long-term and repetitive,education and self-education,teaching students in accordance with their aptitude and differential treatment,and paying attention to the relationship between exercise volume and effect are the implementation ways. The nurturance education model with teaching and practice guarantee,management and feedback guarantee,research and innovation guarantee as the implementation guarantee aims to provide theoretical reference for the nurturance education of teenagers ' independent fitness behavior.