PangYak-Happyon(方藥合編) is probably the most widely circulated and highly valued as an indispensable manual of medical prescriptions among the practising Korean herb-doctors since its first publication in 1884. The book was compiled by a man named Hwang Toyon(黃度淵, 1807~1884), who established himself in the nations capital, Seoul, as a practioner in Oriental Medicine for many years and later became very famous for his competence as a doctor. He is known to have served even as the chief attending physician on the reigning monarch, King Kojong. The main purpose of this paper is to analyze the structure or composition of the book and evaluate the reliability and effective value as a manual in the medical field. The paper also dealt with the significant role the book has been playing in Korean medical field, even into present day. One of the conclusions the author reached through this study is that the book is so well organized in many ways to serve as the most useful guidance for the doctors, and some of the concrete aspects of the organization is examined in detail in this paper.