Abstract: There exist two understandings about physical education: "body education" and "education through body".With a traditional disciplinary cognition and profound philosophical basis, the former proclaims the tool nature, while the latter argues against it and declares the right of pre-existence, subjectivity and initiative of the body.The idea of body through education emphasizes all physical education must establish the body-based criterion from the beginning.Physical exercise is symbiosis of body, spirit and mind, which is not only connected with benefit, truth and beauty, but related to human's psychology, character and happiness.Body seeks benefit, truth, good and beauty by its own exercise methods, which is human's psychological intention and desire of happiness and makes human's character integrated.In a word, life happiness stems from the happiness of psychology and the psychological happiness from physical activities.Being a physical exercise, sport possesses the wisdom of natural ethics and generated human ethics, presenting the significance of life.