（1. School of Leisure Sport，Shanghai University of Sport，Shanghai 200438，China；
2. Department of Physical Education，Shanghai University of Engineering Science，Shanghai 201620，China)
Abstract: By using research methods such as literature survey, Delphi method, level analysis and questionnaire survey, based on the social ecological system theory as the basis, the authors established a teenager physical exercise habit influ-encing factor theoretical model. The authors verified the degree of adaptation of the measured data and the theoretical model by applying second order confirmatory factor analysis, and ultimately established a teenager physical exercise habit influencing factor structural model consisting of such 4 level 2 indexes as individual, family, school and social factors, and 25 level 3 indexes. Through further analysis, the authors found that various factors’ influence on teenager physical exercise habit formation had age and gender differences. In which, boy students were obviously better than girl students; the younger the age, the more obvious the influence of individual and family factors; as the age grew, the influence of social factors became more obvious; at the ages of 16-18, the influence of family factors reached the peak, but gradually de-creased as the age grew. Therefore, the authors put forward intervention measures suggested according to the working characteristics of age and gender influencing factors, hoping to promote teenager physical exercise habit formation.
Key words: physical exercise habit；influencing factor；model verification；social ecological system theory；teenager