The method of boiling water for Tongzhi is, first of all, Tongzhi for preliminary cleaning, put into cold water to soak for more than 20 minutes, add the water above the surface of the medicine, boil and then change to low heat and continue to cook for about 10 minutes, pour out the medicinal juice to drink can be. Tongcao is the dried stem pith of the plant Tongtuomu in the family of Wujiaceae. It is sweet and light in flavor, and slightly cold in nature. It belongs to the lung and stomach meridians. It has the effect of clearing heat and diuretic, and passes qi to lower breast milk. It is used in the treatment of damp-heat gonorrhea (increased frequency of urination, dribbling and astringent pain), edema and urination, and lactation. Tongcao should not be used with malt when treating lactation, and should be used with caution when there is deficiency of both qi and yin (deficiency of both qi and yin), and when there is no dampness or heat in the body; and should be used with caution by pregnant women. Patients are advised to use the medicine under the guidance of a doctor.