The extraction methods of amino acid in tea by boiling water,0.1N hydrochloric acid,methyl alcohol,anhydrous alcohol,85% alcohol and 60% alcohol were compared.The result showed that the best effect was by ultrasonic extraction in 60% alcohol within 60 min.The methods with electromagnetism hydrolysis and ultrasonic were compared.The result showed that the electromagnetism hydrolysis method was excellent than ultrasonic wave method,but sulfur-containing amino acids were destroyed by electromagnetism hydrolyti...