The pathological characteristics of intracranial tumors: 1. Intracranial tumors lack lymphatic vessels, so there is no lymphatic metastasis, and hematogenous metastasis is also relatively rare; 2. There are various forms. Surgery is the most important and basic method to treat intracranial tumors. However, because of the limitations of tumor location, size, growth pattern, pathological type, biological behavior, and how to protect the important functions of the central nervous system, “radical resection” is largely unattainable. Therefore, radiation therapy for intracranial tumors is becoming more and more important. The NCCN guidelines for radiotherapy of low-grade e glioma state that the indications for postoperative radiotherapy are: 1. astrocytoma: tumor diameter >150px, tumor over midline, age >40 years, KPS <70, preoperative neurological impairment, no 1p19q joint deletion or IDH1IDH2 mutation found. Patients meeting 3 and above are considered high-risk 2. Non-complete resection surgery. Postoperative radiotherapy can prolong the survival of patients with malignant glioma and reduce the rate of local recurrence. NCCN guidelines recommend: 1. Radiotherapy is recommended to be started as soon as possible about 2-4 weeks after surgery. 2.Conventional divided external irradiation with a total dose of 54-60 Gy is strongly recommended. 3.X-knife or γ-knife is not recommended as the preferred treatment modality for malignant glioma after surgery. 4.Temozolomide 75mg/m2/d synchronous chemotherapy during radiotherapy is strongly recommended, followed by 6 cycles of temozolomide adjuvant chemotherapy. 5.Patients with postoperative brain tumors should come to the clinic as soon as possible to contact radiotherapy.