Parotid tumor refers to a tumor of the parotid gland. Radiotherapy is usually not necessary after surgery if the parotid tumor is low-grade malignant in the early stage, but it is necessary if the parotid tumor is in the advanced stage. Parotid tumors belong to a group of neoplastic diseases that occur in the parotid gland and can be divided into benign and malignant tumors. Whether radiotherapy is necessary after surgery for low-grade malignant parotid tumors depends on the specific condition and cannot be generalized. In case of early stage parotid tumor with low grade malignancy, generally speaking, there is no need for postoperative radiotherapy. However, for advanced parotid tumors, even if they are of low malignancy, postoperative radiotherapy is necessary, which can improve the local control effect and increase the survival rate of patients, and reduce the probability of recurrence. Patients with parotid tumors need to actively cooperate with doctors for treatment, strengthen daily life management, and go to the hospital for follow-up on time. After receiving surgery and radiotherapy, patients should also actively cooperate with doctors to strengthen the training of maxillofacial mouth function.