A. Decoction water should be used to meet the national health standards of drinking water, decoction water must be odorless, clean and clarified, containing few minerals and impurities, generally available clear spring water, river water and tap water. The amount of water should be calculated according to the texture of the tablets, water absorption, decoction time, evaporation during decoction and the amount of liquid required after decoction. Soaking before decoction is beneficial to the full dissolution of the active ingredients and can shorten the decoction time to avoid the depletion and destruction of some of the active ingredients due to the long decoction time. Most drugs should be soaked in cold water for 20-30 minutes for general drugs, and 1 hour for seeds and fruit-based drugs. High summer temperatures, soaking time should not be too long to avoid corruption and deterioration. (1) first decoction: shells, crusts, fossils and most mineral drugs, such as oysters and magnets, should be decocted for about 30 minutes before incorporating into other drugs because their active ingredients are not easily decocted. There are also some Chinese medicines with high toxicity, such as Radix et Rhizoma, Radix et Rhizoma, etc., in order to reduce their toxicity and ensure the safety of medication. (2) After decoction: Flowers, leaves and some roots and stems are easily volatilized or destroyed when decocting active ingredients, such as peppermint, rhubarb, senna, etc. It is advisable to decoct them afterwards, and then include them in other medicines after they have finished decocting for 5-10 minutes. (3) Melting: Colloidal drugs such as antler gum, gum, etc. should not be decocted with other drugs, and need to be stewed separately and then blended into other drugs to be taken together. (4) Flushing: Drugs that should not be decocted (such as mannitol) and liquid drugs (such as bamboo leech, ginger juice, etc.) should be flushed with boiling water or mixed with other liquids. V. Decoction times When decocting a drug, its active ingredients will first dissolve in the aqueous solution entering the herb’s tissue, and then diffuse into the aqueous solution outside the herb, to the point where the concentration of the solution inside and outside the herb reaches equilibrium, the active ingredients will no longer dissolve due to osmotic pressure equilibrium. At this point, the herb needs to be filtered out and then re-added to the water decoction for the active ingredients to continue to dissolve. In order to make full use of the herbs, avoid waste and ensure the efficacy, it is better to decoct a dose twice and mix the juice of two decoctions before dividing it. The amount of decoction should be determined separately for children and adults. Each dose should be decocted to 100-300ml for children and 400-600ml for adults, and each dose should be divided into two equal portions, or as prescribed by the doctor. Decoction operation 1. Calculate the amount of water to be added according to the number of doses of Chinese medicine, the weight of the decocted drug, the texture of the drug, the decoction time and the amount of the decoction, calculate and add water with an automatic water dispenser, and soak the drug for 30 minutes. 2. Generally, it is advisable to use martial fire (large fire) first and then civil fire (small fire), using large fire before boiling and small fire after boiling to maintain a slight boiling state. The decoction time depends on the nature and texture of different drugs, usually decongestants and other aromatic drugs are boiled quickly with wu huo, and then maintained with wen huo for about 10-15 minutes to avoid the loss of aroma and medicinal properties due to prolonged boiling; tonic drugs are maintained with wen huo for 30-40 minutes after boiling to make the active ingredients fully dissolved. 3. Pay attention to the types of medicine that require special operations such as decoction first and later, and retain the characteristics of traditional decoction to meet the needs of different prescriptions. 4. Each dose of Chinese medicine should be decocted twice or three times to fully decoct the active ingredients of the medicine and improve the therapeutic effect; the medicine should be fully decocted so that there are no paste-like lumps, no white heart and no hard heart. 5. The decoction should be prevented from overflowing, drying out or scorching. Decoction of dry or scorched is prohibited for medicinal use. 6.Distinguish between internal medicine and external medicine by using different signs. 7.The decoction should be put into a cleaned and disinfected container that meets the requirements for food and prevents contamination. 8, the use of decoction machine decoction of Chinese medicine, decoction machine decoction function should be in line with the relevant requirements of this specification. Should be decocted at atmospheric pressure, the decoction temperature generally does not exceed 100 ℃. The amount of decoction should be consistent with the dosage of the prescription, and the dosage should be evenly distributed. 9. The materials used for packaging the liquid should comply with the national standards for pharmaceutical packaging materials. Eight, the decoction environment is conducive to the work of the decoction staff, the maximum protection of drugs and liquid decoction quality, the ambient temperature at 5 ℃ ~ 40 ℃; relative humidity: ≤ 85%.