Objective To discuss if the intraoperative releasing inferior pulmonary ligament would affect the postoperative compensatory dilation of the residual lung in the patients going through the resection of the upper lobe under the thoracoscope. MethodFrom January 2010 to June 2014, 100 patients with lung cancer of right upper lobe were undergone resection of the upper lobe under thoracoscope in our department. They were randomly divided into two groups, the experimental group( the non-released group) with 50 people who were not released inferior pulmonary ligament during resection of the right upper lobe under thoracoscope. The control group(the released group) with 50 people who were released inferior pulmonary ligament during resection of the right upper lobe under thoracoscope. Observed the amount of daily thoracic cavity drainage, total drainage, the average extubation time and length of stay after the operation. Results Statistically compare postoperative residual cavity fluid level reserved rate of two groups of patients.There does not exist significant difference (P > 0.05) and the average drainage on the chest also is not significant (P > 0.05). Besides, there does not exist significant difference (P > 0.05) in the average time of decannulation of chest drainage tube, pleural biopsy cases and times, and postoperative hospital stay between two groups either. ConclusionIt’s unnecessary to release the inferior pulmonary ligament during resection of the right upper lobe under thoracoscope, which will not affect postoperative recovery and prolong length of hospital stay. Therefore it’s suitable for clinical promotion.