Treatment of papillary thyroid cancer mainly includes surgery, postoperative radioactive iodine therapy and thyroid-stimulating hormone suppression therapy. 1. Surgery: it is the first choice of treatment for papillary thyroid cancer. Besides removing the primary lesion, post-surgical specimen can also be used for accurate pathological diagnosis and staging, assessing the extent of lymph node spread and clearing the involved lymph nodes. 2. Radioactive iodine therapy: Even with total thyroidectomy, some thyroid tissue may remain, especially in the thyroid bed and around the parathyroid glands. Therefore, radioactive iodine therapy is necessary to remove the remaining thyroid tissue and residual tumor cells. 3. Thyrotropin inhibition therapy: long-term thyrotropin inhibition therapy with L-T4 after papillary thyroid cancer surgery can satisfy the physiological demand of the body for thyroid hormone; papillary cancer cells express thyrotropin receptors on their surface, which is responsive to the stimulation of thyrotropin, and the use of supraphysiological dose of L-T4 to inhibit serum thyrotropin level can reduce the risk of tumor recurrence. Suffering from papillary thyroid carcinoma should be treated promptly to avoid delay.