The time of removing the drain after thyroidectomy should be objectively analyzed based on the amount of fluid in the drain and the size of the surgical wound. If the thyroid gland is benign, no lymph node dissection is needed during the operation, the surgical wound is small, and the amount of fluid in the drain tube is small, the drain tube can be removed about 48 hours after the operation, so as to avoid local infection caused by the drain tube being left in place for a long period of time. Second, if the patient due to thyroid malignant tumor surgical treatment, intraoperative clearance of peripheral lymph nodes, surgical trauma is larger, more drainage fluid in the postoperative drainage tube. In this case, the drainage tube should be placed for a longer period of time, and it takes 3-4 days to remove the drainage tube, so as not to remove the drainage tube too early, which may cause the fluid in the trauma to be unable to be discharged smoothly, and then cause the infection of the incision.