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 thesubjects of the Professional sports when in the process of market operations ,and what is therole of sports federations in its activities, are the common concern of scholars. In this articlethe auther analyze this issue mainly from the angle of the legal relations amongprofessional sports federations, clubs and atheles. Strive to have a more clear understandingand expectation for our professional sports legislation to provide a reference.