Lymphatic metastasis is usually for cancer, thyroid cancer is usually related to chronic thyroid stimulating hormone, if thyroid cancer metastasizes to the lymph, the condition is more serious and should be treated timely, usually by surgery. The main metastatic route is lymph node metastasis in the neck. The characteristics of lymph node metastasis are: most of the metastatic lymph nodes are around the veins in the neck, and they also metastasize along the lymphatic vessels to the triangle at the back of the neck, and sometimes to the mediastinal lymph nodes. Metastatic thyroid cancer lymph nodes are usually treated by surgery and radiotherapy. Surgery is usually done to remove as many lymph nodes in the neck as possible, which is very dangerous if the disease is not controlled and metastases occur. Radiotherapy is one of the local treatments for metastatic thyroid cancer. Radiotherapy is more damaging to the body because it kills a large number of normal cells while killing cancer cells. Therefore, patients with lymphatic metastasis of thyroid cancer should choose according to the extent of the disease. Therefore, lymphatic metastasis of thyroid cancer is very serious and treatment should be taken in time so as not to delay the treatment and make the disease worse.