Juvenile rheumatoid arthritis (JRA), an autoimmune disease, was characterized by chronic synovitis and associated with various extra-articular manifestations. Abnormal hematologic findings have been reported in all form of JRA, especially anemia due to chronic disease or iron deficiency. Dysplastic changes were rarely noted in the peripheral blood and bone marrow. We experienced a 15-year-old female patient with pauciarticular JRA who have pancytopenia in peripheral blood and a number of dysplastic changes in bone marrow, and present the case here with brief review of literatures.(Korean J Med 59:587-590, 2000)