"EuiBangYooChui"(Classified Assemblage of Medical Prescriptions) preserves important historical documents about herbal medical prescriptions up to the beginning of Ming dynasty. Mikisakae, a well-known medical history scholar of Japan, attributed high values on "EuiBangYooChui"(Classified Assemblage of Medical Prescriptions) as he stated that it summarized all medical knowledge of all over China and promulgated korean medicine to world top level. "EuiBangYooChui"(Classified Assemblage of Medical Prescriptions) thoroughly cited herbal prescriptions of 150 medical books of China which contents reach up to 9.5millions of letters. Also clarified all the sources of its contents. These efforts made easy the utilization for upcoming experts. Existing block books serves in various aspects of philological field, such as revision of lost documents, block book studies, contents studies, medical history studies, letter studies, phoneme studies and scholia.