Preoperative evaluation of pulmonary function with spirometry can identify those at increased risk of morbidity and mortality owing to pulmonary complications following pulmonary resections. To assess the correlation between FVC, FEV1.0/FVC, EFE25-57% and MVV, measured preoperatively, and the incidence of pulmonary complications following pulmonary resections, a hundred patients who had pulmonary resections were selected. Patients were divided into two groups postoperatively. In group A, there was no postoperative pulmonary complication, and in group b, there were one or more complications. We compared the results of the preoperative pulmonary function tests of the two groups. The difference of FVC between the two groups was statically significant [p<0.01] and FEV1.0/ FVC [p<0.O01]. The differences of the FEF25-75% and MVV were not significant.