The volatile compounds of the goat milk and cow milk were extracted by head space solid phase micro extraction(HS /SPME),separated and identified by gas chromatography-mass spectrometry(GC /MS).The results showed that 45 compounds were obtained from goat milk,mainly consisting of acids,hydrocarbons,ketones,and aromatic.33 compounds were obtained from cow milk,mainly consisting of acids,hydrocarbons,alcohols,and ketones.Nineteen of them were the same components including acids(7 kinds),hydrocarbons(4 kinds),aromatic(3kinds),esters(2 kinds),ketones(2 kinds),alcohols(1 kinds),aldehydes(1 kind),and other compounds(2kinds).Volatile component of goat's milk was more complex than that of cow's milk,especially in volatile acids.