Chai Hu is a commonly used Chinese herb with a bitter and slightly cold taste. It enters the liver and gallbladder meridian, and is the leading medicine of the liver and gallbladder meridian, as well as the main medicine for treating lesions of the liver and gallbladder meridian. According to the theory of the five elements of Chinese medicine, liver and gallbladder should be in spring. The characteristic of spring is that the weather turns from cold to warm, trees sprout, everything revives, and yang energy develops, so Chai Hu also has this characteristic, which can unblock qi and make the body’s qi flow smoothly without stagnation, so it has the effect of unblocking liver and qi and relieving depression. According to the parts of the human body, the human body can be divided into three parts: table, lid and half table and half lid. Table is the epidermis of the human body, lid is the digestive system of the human body, half table and half lid is the middle part of table and lid, including the chest and abdominal cavity and various orifices and mucous membranes of the human body. The more commonly used medicine is Xiao Chai Hu Tang. The more common medicine is Xiao Chai Hu Tang. There is also Chai Hu injection, which has been made into a ready-to-use medicine to treat febrile illnesses with chills. At the same time, Chai Hu also has a very important role in promoting the body’s metabolism and the process of metabolism.