This study examines the impact of early Jae Jung Won’s works to the Korean society in early Korean mission era. Because Jae Jung Won founded by Korean government and American missionary. Allen was a first Western mordern hospital in Korea. Medical works had significant meanings on the Korean mission. Mordern medical works of American missionaries in Korea included the spirit of Christianity which was a mental ground of Western civilization and medicine. Because Korean government did not permit the freedom of Christian mission except medicine and education in early Korean mission era, Jae Jung Won had important role of Christian mission at that time. In fact, through the Western medical cure of Allen for Young-ik Min, a high official in the government in 1884, Korean government felt kindly toward American missionaries and Western medicine. There are several meanings of the early Jae Jung Won’s works from the missionary point of view. First, due to the role of Jae Jung Won, images of Protestant in Korea get better. And the influence of Protestant became larger as time goes by. Secondly, Jae Jung Won had a role of ecumeical works through the cooperation of denominations and missionaries for Korean mission. Thirdly, foreign missionaries through activities of Jae Jung Won performed their functions most effectively at that time. Taking care of patients itself was to be a mission, and to introduce Christian love to the Koreans. Fourthly, another meaning of early Jae Jung Won’s works to the Korean society was to educate Christian talents to the Korean youth through the education of medicine. Fifthly, Jae Jung Won’s works in early era to the Korean society was to the gate of civilization for the Koreans like campaigns for enlightenment and hygiene. Therefore Western mordern medical works with the center of Jae Jung Won from 1880’s to 1890’s were effective mission in Korea.