Teacher is the most important key in physical education learning of junior high school because almost every junior student likes the course of physical education. If they have a good physical teacher taught them how to exercise properly, they will cultivate a habit to exercise and gain advantage by doing that in their life. On the contrary, their talented instinct could be destroy without adequate instructions. Due to teacher play a very important role in junior high school physical education, furthermore, teacher's background and advanced activities are the directly factor to influence their ability in teaching. Therefore, this study focus on teacher's background and their activities of four junior high schools in Taipei county, make an evaluation and come up with the following conclusion: 1. On teachers' background: (1) It is a common situation that PE course is instructed by the tutor. (2) The ratio of female and male PE instructors is a wide gap. (3) It is common that PE instructor need to operate administrative position. (4) It is common that unprofessional teacher teaches PE course. (5) Professional physical teacher is very insufficient injunior high school. 2.On teacher's advanced activities: (1)Physical teacher's advanced activities in junior high school is very insufficient. (2)Physical teacher's advanced activities in junior high school is still to over look by education and government.