Objective:To construct a Trans-contextual model to examine the influence of need support provided by teachers in PE class on autonomous motivation,behavioral intention and actual participation of physical activity in adolescent in leisure time.Methods:1300 high school students aged from 11 to 18 were taken as participants,and Perceived Need Support Scale in Physical Education,Perceived Locus of Causality(PLOC)scale,Chinese-translated Behavioral Regulation in Exercise Questionnaire-2(CBREQ-2),Theory of Planned Behavior Questionnaire,and Go...