After being informed about the study and potential risk, all patients giving written informed consent will undergo a screening-period to determine eligibility for study entry. Before operation, patients will be randomly assigned to conventional intubation process group or modified intubation process group before the operation. After the operation, patients will enter the PACU（post-anaesthesia care unit） for further observation. When the anesthesiologists and surgeons agree that patients have no early oral drinking high-risk factors, patients will be randomly assigned to early resumption of oral intake group or late resumption of oral intake group for further observation and evaluation.
The purpose of this study is to assess the effect of modified endotracheal intubation procedure combined with early oral intake on postoperative recovery quality of patients, so as to further optimize the ERAS（enhanced recovery after surgery） program for thyroid or parathyroid surgery.