The purpose of this study is to understand the effective teaching behaviors and influential factors among the expert teachers of physical education in the junior high school. Qualitative research method was adopted. Six expert teachers of physical education in the junior high school to conduct a semi-structured interview, who has serviced for more than ten years and has already gained a good reputation in teaching enthusiasm and teaching effectiveness. In this study, we will also collect data by document analysis and participation observation, and the information will be encoded, continuous induction, comparison and analysis. The results shows that experts teachers of physical education in the junior high school have excellent teaching plan, teaching strategy, teaching evaluation and teaching atmosphere. And their concept of effective teaching plan includes teaching plan, teaching design, content and arrangement. The concept of effective teaching strategies includes learning motivation, multidimensional teaching, group learning, demonstration; The concept of effective teaching assessment include assessment of content, feedback and rewards and punishments, teaching reflection; The concept of effective teaching atmosphere includes teacher enthusiasm, classroom management, teacher-student relationship, teacher expectation, etc. The results of the interview shows that the experts teachers of physical education in the junior high school have demonstrated excellent teaching plan and preparation behavior, multiple effective teaching strategies and methods, intensive and effective teaching feedback, revision and review behavior, and good teaching interaction with teachers and students.