Abstract: In the new century, sports training theories supporting the rapid development of competitive sports in China, are facing pressures and challenges. In view of this, this present paper uses the methods of literature and historical research to analyze the development mode, problems and reasons of China's training theory in the new century The research shows that reductionism is one of the methodologies that affect the training theory development, and is a major hindrance to further development. This can be attributed to both the traditional biased concepts in epistemology, and the criticism of complexity research in methodology. The research methods on training theory in China are limited by the reductive methodology of "constitution holism" and "causality". Paradigm change is an important mission in contemporary time. Complexity research, as a new paradigm, is different from reductionism in nature, and has penetrated into the framework, concept, viewpoint and logical connotation of training theories. This study puts forward the proposition of "upgrading training arrangement and competitive ability structure" and holds that it is the breakthrough point and new direction in training theory research in China.

Key words: training theory, hindrance, breakthrough point