Most nasopharyngeal cancers are undifferentiated cancers, which have high sensitivity to radiation, so radiotherapy is the main treatment for nasopharyngeal cancer. Nasopharyngeal cancer is prone to metastasis of surrounding neck lymph nodes, and combined face and neck field irradiation is usually used. In other words, the scope of radiotherapy includes multiple target areas of nasopharyngeal primary tumor and lymph node metastasis in the neck, with external radiotherapy as the main treatment and intracavitary irradiation as a supplement. 70Gy/6-7 weeks, and 50-60Gy/5-6 weeks for preventive irradiation area of the neck without lymph node metastasis to improve radiation distribution and reduce radiotherapy damage to normal tissues, which can play the role of rescue treatment for some patients with local recurrence and can improve the tumor local control rate.