The purpose of this study is to observe the effects of transcutaneous electrical acupoint stimulation(TEAS) on postoperative recovery after laparoscopic colon surgery.

Patients were randomly assigned to two groups, receiving TEAS andno stimulation respectively. Interventions were given 30min before anesthesia and 1, 2 , 3 day after surgery, lasted 30min each time . The acupoints of TEAS group are bilateral ST36/SP6 combined with PC6/LI4, and the control group only attach electrodes without electric current. The frequency of TEAS is set to 2/10 Hz. After surgery, the time of meeting discharge criteria, first flatus and defecation were recorded. Score of PONV, life quality, sleep quality and VAS of pain were evaluated 24, 48 and 72h after surgery. The postoperative complications, re-exploration, cost of hospitalization and adverse events were also recorded.

Inclusion Criteria:

• Age between 18 to 75 years old；
• ASA I-III；
• Scheduled for elective laparoscopic colon surgery under general anesthesia；
• BMI between 18 and 30；
• Informed consented.

Exclusion Criteria:

• Patients with contraindications to the use of electroacupuncture, such as skin damage or infection at the acupoints；
• Patients with difficulty in communication；
• Emergency surgery；
• Patients who are with distant metastasis;
• Patients who are with history of myocardial infarction or cerebral infarction in the past six months；
• Patients who are with long history of taking NSAIDS，hormone or immunosuppressive agents；
• Patients who are recruited in other clinical trials in the last 3 months；
• Other situations researcher think shouldn't be included.

Inventions were given by an investigator who is not involved in patient care. The anesthetists, surgeons,staff in the ward, the one who record the outcomes, and data analyzer were all blinded to the group allocation.