The concept of yin and yang in traditional Chinese medicine（TCM） is the basic concept of TCM

and its connotations are mostly specific and clear

mainly including attribute concept

relationship concept and entity concept. The characteristics of yin and yang in TCM are highlighted in the division principal of yin and yang and the complex relationship between them

including the characteristics of harmony rather than balance

the treatment rather than opposition

the relative and absolute relationship between yin and yang. A thorough understanding of the concepts and characteristics of yin and yang in TCM is of great significance for correctly understanding TCM theories

carrying out innovative research on TCM theories and guiding clinical application.