It is not always easy to detect and interpret radiologic findings of pediatric pneumonia. Authors retrospectivel analysed radiologic findings of 102 cases of pediatric primary pneumonia treated at Yeong-Deung-Po City Hospital bet ween 1988 and 1990 to understand the past trend of radiologic pattern and to attain helpful information in diagnosing pediatric pneumonia hereafter. Results were as follows. 1.Positive radiologic findings were noted in 85 cases(84%), but 17 cases(16%) showed indefinite lesion. 2.The cases of infantile pneumonia(under 1 year of age) were 44. The most frequent finding was bilateral peribronchial infiltration with overearation(21 cases, 48%), followed by multiple patchy atelectasis associated with the findings of bilateral peribronchial infiltration and oberaeration(nine cases, 23%), peribronchial infiltration without definite overaeration(six cases, 14%), alveolar consolidation superimposed on the peribronchial infiltration(three cases, 6%), alveolar consolidation(three cases, 6%) and bronchopneumonic pattern(two cases, 4%). 3.The cases of pre-school age(1-5 years of age) were 34. Bilateral parahilar peribronchial infiltration was the frequent finding(24 cases, 71%), followed by alveolar consolidation(six cases, 17%) and bronchopneumonic pattern(four cases, 12%) 4. The cases of school age(over 6 years of age) were seven. Six cases(85%) showed alveolar consolidation and one case(15%) showed bronchopneumonic pattern. In short, the younger the patient was, the more frequently the interstitial infiltration occurred. Furthermore, overaeration and patchy atelectasis were uique findings of infantile pneumonia. After the school age, the pattern of pneumonia become similar to that of adults.