Ethyl acetate is an important active aroma ester compound in Baijiu， and it has important impacts on the style and quality of Baijiu. Therefore， it is of great significance to study its formation mechanism in Baijiu brewing process. Systematic study and analysis of Baijiu brewing process showed that ethyl acetate in Baijiu mainly came from biosynthesis pathway. Meanwhile， aroma-producing yeasts are the main strains that produce ethyl acetate. Especially， the research progress of alcohol acetyltransferase， which is one of esterification enzyme， in the synthesis of ethyl acetate in yeast was discussed. Meanwhile， the research on the synthesis of ethyl acetate by alcohol acetyltransferase in aroma-producing yeasts was prospected.