Major raiographic changes almost always occure after surgery for pumomoary resection. With careful attention to the timing and clinical setting of these alterations, their significance can be evaluated and their manamgement planned. This paper reviews the expected postoperative changes as well as those indictating a potential complicaton of surgery of 144 patients who had been operated form May 1972 to Dec. 1980 in the Hangyang Univetsity Hospital. The results were as follows : 1. Total 144 cases included 36 cases of pneumonectomy, 77 cases of lobectomy and 31 cases of segmentectomy. 2. The most common causes of lung surgery were lung cancer in pneumonectomy, bronchiectasis in lobectomy and pneumonthorax due to bulla rupture in segmetectomy. 3. Normal ostoperative raiograpic alterations of pneumonectomy showed gradual accumulated fluid in the vacant hemithorax with shifting of mediastinum and diaphragm to the operation side, Total opacification of hemithorax was observed from ostoperative 7 days to 3 months. 4. Normal postoperative raiographic changes of lobectomy and segmentectomy showed minimal pneumothorax too, but it was soon disappeared with full lung expansion. Mediastinal or diaphragatic shifting to operation side was seen in lobectomy but it was not remarkable in segmentectomy. 5. 41 cases out of total 144 cases(28.5%) showed postoperative pulmonary complications. The complication rate of the group of lobectomy (32%) and segmentectomy (32%) were much higher than the group pneumonectomy(17%). 6. The complications were stelectasis, pneumonia, dead space, bleeding and BPF in segmentectomy.