The principle of postoperative calcium supplementation after thyroid surgery differs according to whether the parathyroid glands are damaged or not.1. If the parathyroid glands are removed during the surgery, and the blood supply of the parathyroid glands is seriously affected, the patients often have a significant decrease of blood calcium index after the surgery, and the patients may show numbness of lips and lips and twitching of the limbs. In this case, patients need to supplement calcium gluconate 20-30ml per day, and need to recheck the blood calcium every day, if there is a sudden low-calcium convulsion, 20ml of calcium gluconate can be supplemented at any time, to maintain the blood calcium index in the normal range as far as possible, to avoid the recurrence of the symptom of cramps. 2, if there is no damage to the parathyroid glands after the thyroid gland surgery, and the recheck of the blood calcium index is normal, and the patients do not have obvious low-calcium convulsions, the patients can be supplemented with calcium gluconate every day. Low calcium convulsions, can be supplemented with 20ml of calcium gluconate per day, or not completely supplemented with calcium gluconate can also be.