Daqu is the driving force for liquor production, which act as a carrier rich in multiple microbes, various enzymes and composites. A lot of famous liquor-making enterprises take Daqu as raw material of liquor production. Liquor yield and liquor quality are greatly affected by the quality of Daqu. Even if the quality of Daqu is so important but in the current production Daqu is still evaluated mainly by sensory indexes. In order to make a scientific evaluation system for Daqu quality the correlations between...