Rhubarb has the effects of clearing away heat, diarrhea, expelling blood stasis and clearing the meridians (removing blood stasis and clearing the meridians), etc. It can be used as medicine in decoction, or brewed and drunk, with the steps of preparation of materials, operation, and drinking method. 1. Material Preparation: Take out a piece of rhubarb and pull off a small piece. Check whether there is mold and other quality problems, if so, it is best not to use. 2. Operation method: put a small piece of rhubarb into a cup of water, pour hot water, let it stand for about 10min, when the water in the cup turns yellow, you can drink. 3. Drinking method: when the first cup of water to drink half of the time, began to store water, add water to the same after the water to stand for about 10min, and so the water becomes yellow when drinking. A small piece of rhubarb, probably can drink a day, the specific dosage should follow the doctor’s instructions, not overdose. Rhubarb in water is suitable for people who suffer from damp-heat dysentery (dysentery caused by damp-heat), solid-heat constipation, carbuncle furuncles (mostly occurring on the limbs or face of the sores, the shape of the small roots of the deep, as hard as nails), and stasis of blood and menstrual closure to drink, but weak spleen and stomach, pregnant women, and in the menstruation period, lactation, should not be drunk. Rhubarb in water to play the medicinal effect is limited, such as the emergence of symptoms, it is recommended that the use of drugs under the guidance of a physician, do not self-medication.