Behcet's syndrome is being detected increasingly in Korea. To collect and document information concern- ing the clinical picture as it is records of patients seen in our clinic in the period between November 1983 and March 1986 were used as source material. In summary, it was found that (1) the total number of patients who had two majors symptoms at least were 410, including 170 men and 240 women; (2) Patients in their thirties were the most common, the mean age being 34.6 years; (3) according to Lehner's classification, the order of frequency of the different types was mucocutaneous (52%), ocular (33), arthritic (14%) and neurologic (1%) and according to Shimizu's classification, it was incomplete (39%), suspected (37%), and complete (24%); (4) oral ulcers, which had observed in 407 patients were the most frequent major symptom, followed by genital ulcers in 338 patients.