The author dissected the signs of and causes for dissimilation in subjects and objects, purposes and means in physical education teaching, which were caused by the violation of physical education and education patterns by "lecturing class", "self-study class", "safety class", "performance class", "3-No class" in elementary and middle school physical education teaching, and concluded that physical education teachers’ theoretical disciplinary knowledge deficiency, information making lowness and "self hematopoietic function incompleteness", education resource deficiency, lacking occupational recognition, influence of social standard and utilitarianism, are main causes for the occurrence of the signs of dissimilation in elementary and middle school physical education teaching.