The purpose of this study is to modify the surgical technique of VATS (video-assisted thoracoscopic surgery) lobectomy for early-stage non-small cell lung cancer, to examine the feasibility of VATS lobectomy performed by less staples, and to evaluate the feasibility of VATS lobectomy performed by modified surgical equipments designed according to the experience of chinese lobectomy surgery, and to generate a chinese standard operative procedure of VATS lobectomy for technique learning and spread. The investigators will intend to recruit 250 patients each group, for 4 groups. Group A(open group) will undergo radical lobectomy via thoracotomy approach. Group B(standard VATS group) will undergo lobectomy via standard VATS approach introduced. Group C(less staples group) will undergo lobectomy via VATS approach with staples limitation. Group D(modified equipments group) will undergo lobectomy via VATS approach using VATS surgical equipments designed according to the experience of chinese lobectomy surgery. The investigators will compare two groups of patients as followed: A vs. B, B vs. C, B vs. D.