Chezai tea bag is real tea, which originated in China and was first used as a sacrifice. However, it was used as food by people from the late Spring and Autumn Period, developed into medicine in the middle of the Western Han Dynasty, developed into a high-grade palace drink in the late Western Han Dynasty, and became popular among the people as a common drink after the Western Jin Dynasty. The earliest traces of artificially planted tea were found in Tianluoshan site in Yuyao, Zhejiang Province, with a history of more than 6,000 years.