Inclusion Criteria:
- Age; 18≥, <75
- Thoracoscopic lobectomy due to lung cancer or suspected lung cancer
- Tolerable cardiopulmonary and other systemic function tolerable to lobectomy
- Karnofsky performance status ≥ 80
- Agree with study
Exclusion Criteria:
- Intolerable to one-lung ventilation
- Bleeding risk due to Aspirin, coumadin and other drugs
- Past or current history of depression or other psychiatric disease
- Pain persisted before operation due to lung lesion
- History of rib fracture, trauma or lung surgery at the same side of operation
- Severe pleural adhesion or empyema
- Open thoracotomy conversion
- Reoperation due to postoperative bleeding or others
- Postoperative complications that need ICU care
- Chemical pleurodesis more than two times after operation
- Do not agree with study