The correct method of taking water decoction is to place the herbs in a container and soak them in the amount of water above the surface of the medicine for 30 minutes to 60 minutes, usually decocted twice and mixed with two medicinal liquids to be taken in two doses. Water decoction is the method of decoction for Chinese medicine soup, generally put the herbs in the casserole and other containers, add water to the degree of higher than the surface of the medicine, soak for 30 minutes ~ 60 minutes, according to the nature of the drug is different to choose the fire, such as antidepressants, such as martial arts fire short decoction, tonic medicines, such as the fire of slow decoction, and so on. Generally, the decoction is made twice, and the amount of water in the second decoction is 1/3~1/2 of the first one, and the mixture of the two decoctions is divided into two doses. Water decoction service specific number of times, take the number of times and decoction time, first decoction, after the next special drugs such as decoction should be operated in accordance with the doctor’s instructions, do not deal with it.