Longjing tea is the first famous tea in Chinese traditional teas,its color is green,its aroma is great,its taste is sweet and its shape is beautiful,for those reasons,Longjing tea is also wildly known in the whole world.The aroma of Longjing tea is special,it was said that the sweet aroma is alike the orchid,the fragrance is faint but not stuffy. In this thesis,the characteristic aroma components of grades and producing areas were extracted and analyzed basing on the existing literatures,and the comb...