1.Medication: Postoperative thyroid cancer patients need to take different doses of levothyroxine sodium (Euthyroxine, Raitis, Gahan, Zenin), the dose of which is related to the amount of thyroid gland removed. The thyroid series, i.e. thyroid function, is repeated 2 weeks after surgery. It will be repeated every 1-2 months until the values stabilize, and then every 3-6 months. For patients with thyroid cancer, thyrotropin (TSH) levels should be kept as below normal as possible to help prevent recurrence. The best result of taking the medication is to keep T3 and T4 within the normal range and TSH level below the normal value. 2. Thyroglobulin is rechecked every 3-6 months after surgery, remember that it is not a globulin antibody. The thyroglobulin test is only meaningful if the thyroid gland is completely removed, but it is not recommended to check thyroglobulin when the thyroid gland is removed on one side. The lower this value proves that there is no recurrence, if it is significantly higher, it means recurrence of thyroid cancer. 3.Thyroid ultrasound and cervical lymph node ultrasound should be reviewed every 3-6 months after surgery. Ultrasound is recommended to go to a large hospital because the ultrasound doctors in large hospitals are more knowledgeable and have a significantly higher diagnostic accuracy and higher diagnostic value. 4.Lung CT and whole body bone ECT, these two are meaningful in patients with thyroid cancer with lymph node metastasis. It can be used to check whether there is metastasis in the lung or whole body bone. It is usually checked once every 1-2 years.