Do not perform lymph node imaging before thyroid cancer surgery. Lymphangiography is a simple, safe and reliable diagnostic method for examining lymph node lesions. It can visualize the internal structure of the lymph nodes, may detect small lesions within non-enlarged lymph nodes, and has the potential to differentiate benign reactive lymph node enlargement from lymph node tumors. Thyroid cancer may present with infiltration of the peripheral lymph nodes, but it is not necessary to clarify the presence or absence of infiltration by lymph node imaging. The location and stage of the lesion can be clarified by symptoms, the presence of peripheral compression symptoms, thyroid ultrasound, and according to the lesion, lymph node dissection can be selected at the time of surgery to improve the pathological examination. Before thyroid cancer surgery, you need to improve the chest X-ray, electrocardiogram, thyroid ultrasound and other assessment of the basic situation, by a professional physician to assess whether the operation can be performed.