Acid enters the liver means that acidic herbs mostly enter the liver meridian. Acid can be astringent and astringent, and has astringent and astringent effects. Sour-flavored herbs can nourish liver yin and liver blood, such as white peony. Sour is one of the five flavors of traditional Chinese medicine, which not only refers to the reflection of the taste of the drug, but also a high degree of generalization of the effect of the drug, which is beyond the scope of taste, and is more based on the efficacy. Sour into the liver, that is, acidic herbs can enter the liver meridian, such as white peony flavor bitter, sour, attributed to the liver, spleen meridian, has nourishing blood and astringent yin, soften the liver to relieve pain (treatment of liver yin deficiency, pain caused by liver blood deficiency), the efficacy of the liver yang suppression, can be used for the treatment of liver and blood deficiency; liver-spleen disharmony (liver and spleen can not work in harmony); liver yang on the over-exuberance of liver yang (liver yang, caused by dizziness, vertigo, headache, and other symptoms) and other conditions. If there are any uncomfortable symptoms, it is recommended to consult the hospital in time and use the medication under the guidance of a physician, not to dispose of it by oneself.