The radiologic findings of chest and long bone series were observed in 49 leukemia in children which wereconfirmed at Chung Nam National University Hospital from April 1974 to Sep. 1979 and the following results wereobtained. 1. The age group of 10 to 15 years was involved most commonly and the male was affected more frequentlythan the female with the ratio of 2.1 to 1. The incidence of acute form was 95.9% and among these acutelymphocytic leukemia was more frequent than acute myelocytic leukemia. 2. The abnormal findings in chest wereobserved in 38.8% and most frequently, pneumonia was observed but inacute lymphocytic leukemia, lymphadenopathywas predominent. 3. The radiolucent transverse metaphyseal bands of proximal humerus in chest P-A were observed in40.8%. 4. The abnormal findings of long bones were observed in 74% and the bone change in acute lymphocyticleukemia were observed more frequently than acute myelocytic leukemia. 5. Femur was involved most commonly andtibia, fibula, humerus, radius and ulna, in other.