Diabetes belongs to the category of Chinese medicine “thirst”, when the evidence is a deficiency of yin can be used chasteberry decoction soup to take. Chasteberry is the mature fruit of chaste tree of the genus Ligustrum, family Mulleinaceae, with sweet taste, bitter, cool nature, and can be attributed to the liver and kidney meridians, with nourishing the liver and kidney, the effect of brightening the eyes and darkening the hair. Chasteberry can be used for liver and kidney yin deficiency (deficiency of yin in the liver and kidneys), dizziness and tinnitus, lumbar and knee weakness (a feeling of weakness in the lumbar area and knees), premature whitening of the hair, darkening of the eyes, internal heat and thirst (internal fever accompanied by symptoms such as overeating and excessive drinking and urination), and bone vaporization and tidal fever (a burst of fever, feeling that the heat is penetrating from the inside of the bones to the outside). Diabetes is a Yin deficiency of patients can follow the doctor’s instructions to take chasteberry, but the efficacy of a single drug is effective, it is recommended that patients under the guidance of a doctor to identify and with other drugs to take, do not take the drug on their own, so as not to delay the condition.