Abstract: About the producing process of ethyl caproate which was regarded as a main fragrant composition of Luzhou Daqu, there is a divergence of research work about the pioneer material-ethyl acetate and ethyl butyrate. After many years’ study , it has been proved that it’s contributed to enzymes and kinds of microbes in which caproic acid bacteria works as a leading role.

Key words: Ethyl caproate Ethyl butyrate Pioneer material