Effect of Perioperative Hypothermia on Postoperative Pain

Inclusion Criteria: * Age 18-70 years old * American society of anesthesiologists I-III * Patients who plan to laparoscopic surgery under general anesthesia * Volunteer to participate in this study and sign informed consent. Exclusion Criteria: * the patient with chronic pain * Patients with fever * The patient is infected * Severe vision, hearing, language impairment or other reasons unable to communicate with visitors * Patients with known mental illness or lack of communication or cognitive impairment before operation; * Long-term use of sedatives, antidepressants or alcoholism * Artificial cooling and low temperature protection were taken during the operation