For patients with differentiated thyroid cancer (papillary thyroid carcinoma and follicular thyroid carcinoma), TSH suppression therapy means taking oral thyroid hormones to suppress TSH at or below the low limit of normal or even undetectable level, to replenish the postoperative thyroid hormone deficiency on the one hand, and to inhibit the growth of differentiated thyroid cancer cells on the other. Utropine) oral formulation. A lot of clinical data prove that TSH suppressive therapy can reduce the recurrence rate of highly differentiated thyroid cancer, improve the overall survival rate of patients and prolong the survival time without recurrence.