The amount of liquid used to decoct herbal medicines ranges from 100 ml to 600 ml depending on whether the patient is a child or an adult. For children, the amount of medicine is smaller and a single dose can be decocted into 100 ml to 300 ml. For adults, the amount of medicine is relatively higher and can be decocted into about 400 ml to 600 ml. Generally, pure water is used for decocting Chinese medicine, if tap water is used, it should be left to stand for several hours, and the temperature of the water should be 25~30℃, and boiling water is prohibited. When cleaning herbs, they should not be rubbed vigorously, and the soaking time is usually 30~60 minutes, and the amount of water added should preferably be more than about 1cm of the drug. It is best to use a casserole for decoction without affecting the effect of the drug. Use martial fire before the water boils, and use gentle fire after the water boils. The longer the boiling time, the less the medicinal juice. Someone should watch the simmering of the medicine and stir it at the right time during the simmering process so that it does not boil dry. Boil Chinese medicine to cover the lid, so as not to volatilize the efficacy of the medicine. Boiling Chinese medicine can not put sugar, so as not to affect the efficacy of the medicine.