Three years. The expiration date of drugs refers to the approved use period of drugs, which means that the quality of drugs can be guaranteed under the specified storage conditions, and it is one of the indicators to control the quality of drugs. The shelf life of Tibetan olives is 3 years. Tibetan olive, also known as Xiqiao, is a big tree, 20 meters high, with alternate or nearly opposite leaves, nearly leathery, ovoid or ovoid, 7 ~ 16 cm long and 3 ~ 8 cm wide. When it was young, it was almost hairless on both sides or slightly hairy under it.