Dragon Boat Festival koji making means that on the fifth day of the fifth lunar month, sauce wine companies begin to make high-temperature Daqu, the saccharification starter used for fermentation. This is mainly due to the following reasons: first, the raw material for making koji, wheat, has matured at this time; second, the ambient temperature is higher during the Dragon Boat Festival, and microorganisms grow vigorously, and koji mainly enriches environmental microorganisms, which is the best way to make koji. Third, although it is "Dragon Boat Festival making koji", in modern industrial production, it is difficult to make koji during this period alone to meet production needs, so koji can be made most of the time throughout the year.