Abstract: In view of the important effect of outdoor sports on the education and development in adolescents,the adherence to outdoor sports attracts more and more attention.Using exploratory factor analysis(EFA) and confirmatory factor analysis(CFA),the validity and reliability of the "Outdoor Sport Motivation Scale for adolescents","Outdoor Sport Atmosphere Scale for adolescents",and "Outdoor Sport Adherence Scale for adolescents" were examined;then stepwise regression analysis was conducted to examine the mediating effect of sport atmosphere between sport motivation and sport adherence.The results revealed that the data for the three scales were represented appropriately by the hypothesized model,and sport atmosphere played partly mediating mechanism between sport motivation and sport adherence.