Neurosurgery grading is mainly based on the difficulty of surgery. The lower the surgical grading, the lower the difficulty of surgery and the lower the requirement for surgeons. The common level I surgeries mainly include cranial defect repair, cranial tumor surgery, and subtemporal muscle decompression. The secondary surgeries mainly include cranial trauma drilling and exploration, chronic subdural hematoma removal, subdural fluid removal, etc. For secondary surgery, it requires attending and above level surgeons to perform. Tertiary procedures are mainly intracerebral hematoma removal, posterior cranial fossa hematoma removal, hypertensive basal ganglia hematoma removal, and olfactory groove meningioma removal. For tertiary surgery, associate high level and above personnel are required to perform the surgery. Level IV surgery mainly refers to more difficult neurosurgical procedures, such as meningioma resection in the pontocerebellar horn region, transsphenoidal approach craniopharyngioma resection, and jugular foramen tumor resection, etc., which can only be performed at the chief physician level.