Forty cases of Korean Hemorrhagic Fever who were admitted to Dae Jeon Eul Ji HospitaI from January 1982 to December 1983, were analyzed, based on gastrofiberscopic findings. The results were as follow: 1) The most frequent incidence was found in the age group of 41-50 years old(30% of the total 40 cases studied); the male to female ratio was 1.86:1.2) The location of petechiae in Korean Hemorrhagic Fever could clinically be observed on the soft palate(45%), conjunctiva(32.5%), and axillary portion(20.0%). By using gastrofiberscopy, mucosal and submucosal hemorrhage were found more than twice as often(85% of the total cases) as the above clinical observation. 3) 64.3% of the total Korean Hemorrhagic Fever found on gastrofiberscopy was of the oliguric type. Severe hemorrhage was found in 50% of the oliguric type, but the severe hemorrhage was not found in the non-oliguric type. 4) In the gastrofiberscopic finding for each phase, positive findings were observed throughout all phases. The most frequent incidence and 50% of the severe hemorrhages were found in the oliguric phase. 5) According to the gastrofiberscopic findings, Korean Hemorrhagic Fever occurred most frequently between the 4th and the 9th day after the onset of the incidence, but was generally observed from the first to the 14th day or later. 6) The most frequent bleeding site in the stomach was the fundus(55%) and the body (50%), but bleeding spread to the entire stomach and the esophagus in 8 cases.