Ku-Ding-Cha is a bitter beverage tea consumed widely in south China as an alternative to green tea and also used as herbal medicine in folk and minority nationality regions. According to acient medical documents, Ku-Ding-Cha is used for clearing heat, helping producing saliva and quenching a thirst, promoting digestion and reducing phlegm, relieving sore-throat and sore-larynx, curing dysentery and so on. Recently Ku-Ding-Cha draws people's attention because of its pharmacological effects such as antiathero...