Adenoid cystic carcinoma is a malignant tumor of epithelial origin, which is highly malignant, prone to local infiltration, and not very sensitive to radiotherapy, and develops and develops rapidly. Local invasion and distant metastasis can occur in early stage, and the overall prognosis is not very good. At present, surgery-based comprehensive sequential treatment is still the main treatment for adenoid cystic carcinoma, and the main principle of radical treatment for adenoid cystic carcinoma is to expand the normal boundary of surgery and to extensively resect the local tumor and some surrounding normal tissues. In addition to extensive resection, radiation therapy can be used for recurrent or advanced tumors. If some anatomical areas cannot be completely treated, postoperative radiation therapy is also needed, and radiation therapy may reduce the chance of recurrence. For cases that lose the chance of surgery, radiation therapy can also be used to control the development and prolong the course of the disease.