The preservation time of boiled Chinese medicine varies depending on the composition of the formula, the preservation method and the storage environment. Generally speaking, patients can keep their own tonics at room temperature (25℃) for one day and refrigerated (0-5℃) for two days. Hospitals on behalf of the decoction of vacuum-sealed packaging, room temperature can be put 7 days, refrigerated can be put about 15 days. If the Chinese medicine is rich in sugar protein, the shelf life will be relatively shorter. Patients often choose medical premises for decoction because they are inexperienced in decocting medicines or are looking for convenience. The shelf-life of decoction preparation varies from one medical venue to another as indicated on the sealed vacuum packaging bags. Some studies have shown that the higher the temperature, the faster the deterioration of the medicinal liquid, and the faster the deterioration will be if the medicinal liquid contains more starch, protein, sugar and other ingredients. It is worth noting that when the stored tonics are taken out for drinking, if you find that the bag bulges or the liquid tastes bad, there are bubbles and other conditions different from normal, consider that the drug has deteriorated and prohibit taking it in order to prevent food poisoning. Soup medicine from the refrigerator, the temperature change will make the liquid properties change, must be heated as soon as possible after taking.