Abstract: In order to clear the aroma components and in vitro functional activities of Hawk tea, GC-MS analysis, DPPH free radical and hydroxyl radical assays, antimutagenicity test, AGS and HT-29 cancer cells proliferation inhibitory test were used for research in aroma components of Hawk tea from Sichuan Mengding region.Thirteen kinds of components were found in aroma components of Hawk tea, they were 7H-Dibenzob, gcarbazole, Decane, 1H-Indole, Propenone, 4-Aminocinnamic acid, Benzo b selenophene-2-carbonitrile, 2-Methylaminomethyl-1, 3-dioxolane, ( E) -2-Fluoro-3- ( 4-N, N-dimethylaminephenyl) -propenoic acid, 2-Methyl-6-tert-octylphenol, Hexadecanoic acid, 3, 6-Acridinediamine, 2-Methylaminomethyl-1, 3-dioxolane and 2-Butanamine. And the aroma components of Hawk tea showed antioxidant, antimutagenicity and anticancer effects.