The need for radiotherapy for glioma is determined by the type of glioma pathology. If grade I glioma is present, radiotherapy is not required. However, if a grade I glioma is not completely removed, or if the patient has more functional impairment after complete removal, radiotherapy may also be administered. Usually glioma is glioblastoma, radiotherapy and chemotherapy must be performed after surgery, because surgery is only a prelude to radiotherapy and chemotherapy to create opportunities after clear diagnosis. Without radiotherapy and chemotherapy, surgery alone is less meaningful because surgery is very traumatic and will cause dysfunction to the patient for a long time. Without radiotherapy and chemotherapy, the patient will soon relapse and develop dysfunction. Some young patients have complete resection and low malignant grade of tumor, and they are not sensitive to radiotherapy and chemotherapy after testing, so they can be observed first. In case of recurrence or becoming high-grade glioma, radiotherapy and chemotherapy may be required.