Through the study of "Kwangje-bikeup"("廣濟秘?"), the writer obtained results as follows 1. The Historical Background of "Kwangje-bikeup"("廣濟秘?") "Kwangje-bikeup"("廣濟秘?") is a medical book written by Lee-Kyunghwa(李景華), a medical doctor in Sungcheun(成川), Pyungan-do(平安道). It was done through the good offices of Lee-Byungmo(李秉模), who was a governor of Hamgyung-do(咸鏡道), in 1790-the 14th year of Jungjo dynasty(正祖). 2. The Author of "Kwangje-bikeup"("廣濟秘?") The author of "Kwangje-bikeup"("廣濟秘?") is Lee-Kyunghwa. Some contemporary historians mistake him for Lee-Kyunghwa who joined the school of Song-siyul. Yet, they are two different people with the same name. Lee-Kyunghwa, the writer of "Kwangje-bikeup"("廣濟秘?") was born in Sungcheun, Pyungan-do, in the year of 1720. At first he studied Confucianism in order to enter government services. Later he passed the Jinsa exam which was the first exam to become a qualified government offical. However, after he was disillusioned in the discrimination against northwestern people, he chose to study medicine and put his effort and time on medicine. Gradually he won a great reputation as a medical doctor and came to write "Kwangje-bikeup"("廣濟秘?") at the request of Lee-Byungmo in 1790. 3. Medical books affecting "Kwangje-bikeup"("廣濟秘?") This book is influenced by "Dongeui-bogam"("東醫寶鑑"), "Suse-bowen"("壽世保元"), "Boncho-gangmok"("本草綱目"), etc. 4. Domestic Herbs in "Kwangje-bikeup"("廣濟秘?") Lee-Kyunghwa seperately recorded clinical cases with domestic herbs in the last volume, which was associated with the effort to have been made for domestic herbs, since the middle era of Koryo.