Through the research into the date of Radix Thichosanthis main blended 21 kinds of prescriptions Radix Thichosanthis from Donguibogam. This study summrized as follows; The suitable dosage of Radix Thichosanthis per one application is one to two don(about $4{sim}8g$). Radix Thichosanthis Radix main blended prescriptions broadly use in the symptoms of diabetes, excessive thirst, cabuncles and eye diseases In diabetes and excessive thirst, the structes of Radix Thichosanthis main blended prescriptions are commonly used Seng Mak San(生脈散), Radix Puerariae(葛根), Frectus Schisandrae(五味子), Radix Ophiopogonis(麥門冬) In Furuncles, Carbuncles and Cancer like diseases, the structes of Radix Thichosanthis main blended prescriptions are generally used Kumeunhwasan(金銀花散), Jipaesan(芷貝散), Twonongsan(透膿散).