Abstract: Human and body are the core elements of sports existence. The relationship between human and body's sports value is the root of sports value. The nature of sports depends on the human before the body or the nature of human for human nature is the basic reference standard of value and moral judgment. According to Sartre's philosophical view of "existence precedes essence"and Heidegger's humanistic view of "existence ontology", only when human has a nature which is in line with its body and takes such human nature as the normative basis for the existence of sports essence can they ensure the existence of human before the body and the rationality and moral legitimacy of sports in reshaping the body. Under the humanistic perspective of harmony between human and body, the essence of sports is the naturalization of body.

Key words: sports essence, human nature, body, naturalization of body