The radioloigic findings of chest and long bone series were observed in 49 leukemia in children which were confirmed at Chung Nam National University Hospital from April 1974 to Septemper 1979 and the following results were obtained. 1. The age group of 10 to 15 years was involved most commonly and the male was affected more frequently than the female with the ratio of 2.1 to 1. The incidence of acute form was 95.9% and among these acute lymphocytic leukemia was more frequent than acute myelocytic leukemia. 2. The abnormal findings in chest were observed in 38.8% and most frequently, pneumonia was observed but in acute lymphocytic leukemia , lymphadenopathy was predominent. 3. The raidolucent transverse metaphyseal bands of proximal humerus in chest P-A were observed in 40.8%. 4. The abnormal findings of long bones were observed in 74% and the bone change in acute lymphocytic leukemia were observed more frequently than acute myelocytic leukemia. 5. Femur was involved most comm nly and tibia, fibula, humerus, radius and ulna, in other.