Abstract: Objective: the paper is to research the influencing factors of?middle school students'?extracurricular physical exercise (family - individual). Method: 1690 samples from middle school students are tested twice successively. The questionnaires with good reliability and validity are compiled. Results: (1)The questionnaires about the influencing factors are of desirable reliability and validity and they can be used as a kind of measurement tool; (2) Family support and the idol worship, value orientation and intention show predictive validity to middle school students’ extracurricular physical exercise, while positive experience and benefits fail to reach significant level to predict middle school students’ extracurricular physical exercise.

Key words: middle school students, extracurricular physical exercise, influence factors, questionnaire, path