To identify yin deficiency or yang deficiency, it is mainly based on the symptoms and signs shown by the patient, combined with the patient’s yin and yang deficiency. Traditional Chinese medicine focuses on the overall concept and discriminatory treatment, so it is necessary to identify yin deficiency and yang deficiency from a holistic perspective. Yin deficiency refers to the loss of yin in the body and the inability to control yang, its nourishing and moisturizing effect is reduced or even disappeared, and the main manifestations are: the body is thinner, thirst and dryness of the throat are obvious, the two cheeks are often red, the heart is troubled, night sweating, small amount of urine, yellow color, reduced frequency of stool, dryness, red tongue, dry tongue with little fluid or little moss. Yang deficiency refers to the deficiency of yang energy in the body, and the functions of yang energy such as warming, pushing, transpiration and gasification are reduced, which cannot meet the needs of the body, manifested as: fear of cold, cold at the end of the limbs, tasteless mouth, sometimes sticky feeling, mouth is not thirsty, like to drink hot water, pale face, usually easy to mental sleepiness, weakness, more body sleepy and heavy, more urine, and clear color, more frequent stools, and more unformed, or like duck loose stool The tongue is dull, fat, or with teeth marks on the edge of the tongue, and the moss is usually white and smooth. These are the symptoms of yin deficiency and yang deficiency, and patients need to be treated under medical diagnosis.