Abstract: The extraction technology of black tea polyphenols was optimized using keemun black tea as material.The effect of ethanol concentration,extraction temperature,extraction time,solid-liquid ratio,p H on extraction yield was investigated by single-factor experiment and the extraction technology was further optimized by orthogonal experiment. The optimum extraction parameters were as follows :ethanol concentration 60%,extraction temperature 70 ℃,extraction time 2.5 h,and solid-liquid ratio 1∶50(g/m L). The extraction yield was(214.23±6.29) mg/g after the second extraction. In addition,UPLC-DAD was applied to identify keemun black tea polyphenols. Results showed that the main components of keemun black tea polyphenols were gallic acid,(-)-Gallocatechin(GC),(-)-Epicatechin(EC),(-)-Catechin gallate(CG),(-)-Epicatechin gallate(ECG),(-)-Epigallocatechin gallate(EGCG),Theaflavin(TF1),Theaflavin 3-gallate(TF3G),Theaflavin 3 '-gallate(TF3′G) and Theaflavin 3,3'-digallate(TF33′G).