To avoid metastasis after thyroid cancer surgery, the practices are as follows: 1. Dynamic observation: the recurrence and metastasis of thyroid cancer after surgery, dynamic observation mainly refers to the local excision of thyroid cancer and whether there is lymph node metastasis, while CT scan of lung, MRI of liver, whole body bone scan and MRI of head are done for regular checkups, which require a review every three months within the first three years after surgery to help 2. Adjuvant treatment: Clinical decision on whether adjuvant chemotherapy, targeted therapy, or other thyroxine replacement therapy is needed after thyroid cancer surgery depends on the postoperative lymph nodes and pathology of thyroid cancer. Because these post-operative adjuvant treatments also help to reduce the recurrence of thyroid cancer metastasis after surgery; 3. Avoid risk factors: Avoid contact with some risk factors for thyroid cancer occurrence, such as radiation therapy may occur thyroid cancer, so avoid radiation stimulation.