Abstract: The volatile constituents in 4 kinds of milk were extracted as oil components by steam distillation and they were separated and identified by GC-MS method. There were benzothiazole, butylated hydroxytoluene, diphenylamine, dodecane, hexadecane, octadecane, enndecane, heneicosane, 2-nonanone, 2-furylcarbinol, pentanoic acid, and etc detected out from the 4 kinds of milk by GC-MS method.