60 ASA physical status I or II patients, aged 18-75 years old , scheduled for elective video-assisted thoracoscopic lobectomy surgery,will be randomized into 2 groups,with 30 patients in each group: 1. control group and 2. treatment group. Patients in treatment group will receive transcutaneous electrical acupoint stimulation(TEAS) during the surgery and at 6h and 24h after surgery. Patients in the control group received only TIVA general anesthesia and sham electrical stimulation. Serum from patients of both groups will be collected at before surgery, 1h and 25h after surgery, respectively. Serum levels of TNF-alpha, IL-1 beta, CXCL8, IFN gamma and IL-4 at different time points will be measured and compared between the two groups.