With China's rapid development of professional sports, various contradictions have emerged, also brought legal problems. What is professional sports? How to locate the relations of the subjects of the Professional sports when in the process of market operations ,and what is the role of sports federations in its activities, are the common concern of scholars. In this article the auther analyze this issue mainly from the angle of the legal relations among professional sports federations, clubs and atheles. Strive to have a more clear understanding and expectation for our professional sports legislation to provide a reference.