Osmanthus fragrans, also known as Cinnamomum cassia, is an evergreen tree growing in subtropical areas and the most important plant for making spices. In the branches and leaves of osmanthus fragrans, there is a volatile cinnamon oil, which contains cinnamaldehyde, eugenol and other components beneficial to the human body. Yugui is mainly produced in Indonesia, Myanmar, China, Viet Nam and Cambodia. In China, Yugui is mainly produced in Guangdong, Guangxi, Yunnan and other places, and most of them are planted artificially, especially in Guangxi, where Yugui has been planted for thousands of years.