Abstract: A model of the influencing factors of adolescent sedentary behavior are constructed and tested by a mixed research method. The result shows that (1) The influencing factors of adolescent sedentary behavior include four main categories: individual, interpersonal, organizational and community. (2) Different levels of influencing factors have different effects on different types of sedentary behaviors of adolescents: ① At the individual level, living habits have a direct predictive effect on education and screen sedentary, and self-control has a direct predictive effect on screen sedentary effect. ② At the interpersonal level, friend support, family support, and teacher support can directly or indirectly affect sedentary time in education, transportation, social, and screen. ③ At the organizational level, the family environment and school environment can have a direct impact on education or screen sedentary, and indirectly affect education, transportation, social, and screen sedentary through interpersonal level. ④ At the community level, the built environment can directly affect the sedentary time of transportation, and it can also indirectly affect the sedentary time of education, social, and screen through the organizational and interpersonal levels. (3) There are group differences in the influencing factors of sedentary behavior models of education, transportation, social, and screen for gender and school stage.