The four qi of Chinese medicine refers to cold, heat, warmth and coolness. In Chinese medicine theory, every Chinese medicine is capable of having its own nature, which mainly includes 4 kinds of cold, heat, warmth and coolness, called the four qi of Chinese medicine. Among them, warm and hot and cold belong to two different properties. If the medicine has the effect of clearing heat, diarrhea and eliminating symptoms such as fever and over-exuberance in the human body, it means that the medicine is cold in nature. If the drug has the effect of warming up the body, eliminating the body’s fear of cold, not wanting to move, not wanting to talk and other symptoms of being too quiet, then it is a warm drug. Generally speaking, cold and cool medicines are needed to treat febrile and exuberant diseases of the body, and warm and hot medicines are needed to treat cold and icy diseases of the body, and depressing and dull diseases of the mind. In short, the four qi of cold, heat, warmth and coolness of traditional Chinese medicine are actually used to correct the yin and yang bias of the human body, the so-called correcting bias with bias, that is what it means.