Yin and Yang theory is the basic theory of Traditional Chinese medicine and ancient Chinese philosophy. This course vividly illustrates the connotation of yin-yang theory and its specific clinical application based on the original text of NeiJing. Specific contents include: Yin and Yang theory to guide TCM to understand the human body, Yin and Yang theory to guide prescription, Yin and Yang theory to guide health-preservation and longevity.