Abstract： Malt in the Han Dynasty was mostly made of wheat with awn， and later barley and wheat with awn were mixed. LI Shizhen believed that they were similar but different，and their indications were similar. Barley gradually became the mainstream in the Ming and Qing Dynasties. The manufacturing methods mostly follow the Qimin Yaoshu. The heat of frying yellow and coke is easy to master. It is better to peel and grind the malt after frying yellow. The peeling process is different from that before and after frying. It is difficult to peel the fried coke. Malt boiling paste is not only a traditional excipient，but also a prescription. The malt koji made by the ancients with malt has nearly disappeared.