There are total 403 prescriptions containing Radix Scutellariae in Donguibogam and among them, 106 prescriptions treat Radix Scutellariae as a principal medicine. This report describes the study on therapeutic range, symptom, pathology and composition of 106 Radix Scutellariae-main blended Prescriptions from Donguibogam. The frequency and percentage of Radix Scutellariae-main blended prescriptions for the therapeutic range are as follows; cold symptom-complex is the most frequent(11 prescriptions, 10.37%) and gynecology is second(10 prescriptions, 9.43%). The symptoms that Radix Scutellariae-main blended prescriptions are made out for are 70 prescriptions of 28 therapeutic ranges, for example, minor Eum physical appearance, fire of triple burners jaundice, etc. The main pathologies that Radix Scutellariae-main blended prescriptions are being affected by cold, fire triple burners, dampness and heat, wind and heat, heat of heart and lung, heat of liver, heat of spleen, etc. Through the research into the composition of Radix Scutellariae-main blended prescriptions, the kind of medicines and certain rules of compounding medicines centering on Radix Scutellariae are deduced as follows: The main combinations of herbal medicines are Radix Scutellariae and Fructus Gardeniae, Radix Scutellariae and Rhizona Rhei, and Radix Scutellariae, Rhizona coptidis and Fructus Gardeniae. The main combinations of prescriptions are Yihwanghwan(Radix Scutellariae, Rhizoma Cotidis, Radix Glycyrrhizae), Boanbaekchulsan(Radix Scutellariae. Rhizoma Atractylodis macrocephalae), Sambohwan(Radix Scutellariae, Rhizoma Cotidis, Cortex Phellodendrj), Samhwangwon(Radix Scutellariae, Rhizoma Cotidis, Rhizoma Rhei), Hwangryeonhaedoktang(Radix Scutellariae, Cortex Phellodendri, Rhizoma Cotidis. Fructus Gardeniae), Daegumhwahwan(Radix Scutellariae, Rhizoma Cotidis, Cortex Phellodendri. Rhizoma Rhei). Sanyeolumja(Radix Scutellariae. Rhizoma Cotidis. Radix Osterici koreani. Radix Ledebouriellae), etc.