The purpose of this is to elucidate the ways of introduction of modern psychiatric care into Korea and to demonstrate the changing patterns of psychiatric care during the time between 1913 and 1927. The study was focused on the clinical activities of the colonial governmental hospital on the basis of the annual reports of the hospital from 1912 to 1928. The investigation has revealed the fact that the first special institution for the care of the mentally ill patients was founded in 1911 in Seoul by the colonial government which was called "Che Saeng Won". It was also confirmed that the first clinical department of the psychiatry in Korea was established in 1913 at the colonial governmental hospital, "Chong-dok-bu Ui-won" which has taken over the role of psychiatric care from Che Saeng Won. The first chairman of the department of pspychiatry was Misuzu Nobuharu and his assistant was Shim Ho-Sub, the first Korean psychiatrist who became assistant professor of psychiatry at Kyongsung medical college in 1916-1917 but moved to Severance hospital and changed his speciality to neurology of internal medicine. The department had two physicians and 4 care persons at the beginning stage and 22 beds for the mentally ill patients in the hospital which had total 330 beds. Later, the department has developed to 54 bed clinic with 4 staff physicians. ...