Meningioma is a common intracranial tumor in adults, second only to glioma in incidence. Most of them are benign, slow-growing, and clearly defined from brain tissue, and only a small percentage (about 1.7%) are malignant. Meningiomas are associated with the arachnoid membrane and can occur anywhere there are arachnoid cells, especially in areas with arachnoid granules. Common sites include: parsagittal sinus, cerebral convexity, pars falciformis, saddle nodes, pterygoid crest, olfactory groove and lateral ventricles. Clinical symptoms are mainly related to the site of tumor occurrence. Smaller tumors are often asymptomatic in early stage and mostly found by chance during physical examination, while larger tumors often show corresponding neurological symptoms due to local brain tissue compression, such as headache, seizure, vision loss, limb weakness, mental personality change, memory loss and loss of smell. From the pathological point of view, meningiomas are mainly divided into three categories: typical, atypical and malignant. Typical meningiomas are further divided into endothelial, fibrous and transitional or mixed types; while atypical meningiomas have the same tissue composition as typical ones, except that the cell growth is more active and the tumor is more aggressive; malignant meningiomas, also called mesenchymal meningiomas, are mainly papillary or sarcomatous, with active cell growth and invasion into the cerebral cortex, even Even in the case of total excision, recurrence can occur quickly. Treatment of meningioma is mainly based on surgical resection. If the patient is older, the tumor is small, there is no pressure on the brain tissue, and there are no clinical symptoms, the patient can be dynamically observed; while for younger patients, surgical resection should be considered first. Meningioma is not sensitive to radiotherapy, so radiotherapy is rarely chosen clinically, but it can be considered for malignant meningioma. Gamma knife has a certain control effect on the growth of meningioma, but it is not the first choice because the tumor does not disappear after treatment, but only slows down the growth rate and may bring damage to the surrounding normal neural tissue. Therefore, gamma knife treatment should only be considered if the tumor is less than 3 cm in diameter, the location is deep and not suitable for surgical resection, or the patient is too old and in poor physical condition to withstand the surgical blow. The blood supply of larger meningiomas is mostly dual blood supply, both from outside the brain and from the brain, which often bleeds more violently during surgery, especially for huge and very blood-rich meningiomas. Therefore, the outcome of surgical resection is closely related to the experience and skill of the surgeon. The more complete the tumor removal, the better the prognosis, but in some cases, total resection should not be pursued in order to avoid damage to important neurological functions. Currently, there are five internationally accepted levels of surgical resection for meningioma, which is the Simpson grading system: Level I: total resection of tumor, with dura and damaged skull removed; Level II: total resection of tumor, with electrocoagulation of dura attached to the base; Level III: total resection of tumor, with dura untreated; Level IV: partial resection of tumor; Level V: biopsy and decompression alone.