[Objective] The aim was to select the black tea extract with high activity.[Method] With black tea of Dajiling in India as raw material,it was extracted by the ethyl acetate after extraction with boiled distilled water,and then the extract was separated in column chromatography;with EGCG,TP,TF,TFMG,TFDG as CK,the ester extract of black tea was made for the experiment on the activity of total antioxidation(T-AOC),and scavenging of OH·,O2-· and DPPH·The LSD method was adopted to compare and analyze the bioact...