Nine steaming and nine drying, also called nine steaming and nine exposure in ancient books. It is a traditional processing method of traditional Chinese medicine, which is generally used to process more precious medicinal materials, mainly tonics. It can reduce the viscosity of the drug and make it easy to digest. In addition to decomposing the toxicity and impurities in the medicine, it can also make the medicine more pure and peaceful, so the curative effect of Polygonatum sibiricum after nine steaming and nine drying will be more prominent.