Thyroid cancer is a relatively common tumor in otolaryngology-head and neck surgery, although the rise of head and neck surgery specialties has led to more standardized treatment of thyroid cancer patients. In addition to the larynx, which is closely related to the thyroid gland and needs to be properly treated, the parathyroid gland must also be properly treated; otherwise, patients may suffer from hand numbness and cramps after surgery, which can be life-threatening in severe cases. However, due to the small size of the parathyroid glands and their close proximity to fat in color, misjudgment often occurs even among experienced head and neck surgery specialists. However, the use of nanocarbon has greatly contributed to the solution of this problem. By injecting a very small amount of nanocarbon next to the tumor during surgery, the parathyroid gland can be quickly identified and thus well protected during surgery. After clinical application, we found that it not only improves the quality of surgery, but also saves time!