Abstract: Using the methods of literature review, descriptive research, inductive inference, logic analysis and synthesis, the present paper discussed the post-2000 relevant studies on the definition, assessment approach and check-and-balance system of the competitive balance of professional sports leagues in China in the hope of laying a foundation for future research and theoretical advancement. The results show that: 1.The concept of competitive balance can be defined in its broad sense and narrow sense so that it can be better understood. 2. In order to make scientific evaluation of the competitive balance of professional sports leagues in its narrow sense, the result-oriented assessment approach must be changed, therefore, a scientific model of assessment should be developed. 3. The current check-and-balance system involves many factors and is too complicated in structure. Therefore, it is advisable to classify the system according to its subject, object and economic or competitive strength. In addition to the above findings, the present paper also discussed the status quo of and problems on the competitive balance of professional sports leagues including its research methods, objects, contents, and results and proposed some questions in relation to its research orientation, to which due attention should be paid.

Key words: Professional Sport, Competitive Balance, Research Findings, Theoretical Studies