The rock slope area is located at the junction of the middle and posterior cranial fossa and is narrow in scope. Because of its location and complexity, this area was previously considered a “no-go” area for skull base surgery. In this area, the posterior communicating artery, posterior cerebral artery, superior cerebellar artery, internal carotid artery rocky segment, midbrain, pontine brain, superior rocky sinus, inferior rocky sinus, basilar plexus, trigeminal nerve (Meccel’S bursa), motoneurotic nerve, talocrural nerve, abducens nerve and other important structures are concentrated, and due to the obstruction of temporal lobe, cerebellum, cerebellar curtain, rocky crest, rock tip and other structures It is very difficult to expose and operate the tumor in the oblique area. The reasonable surgical approach and ideal surgical exposure become the key to successful surgery in this area. In recent years, with the in-depth study of the microanatomy of the skull oblique area and the rapid development of microscopic skull base neurosurgical techniques, a variety of new skull base neurosurgical approaches have been produced. The lateral approach to the rock-slanted region of the skull base (including Kawase approach, anterior approach through the sigmoid sinus, transmural approach, transcochlear approach and enlarged middle skull base approach); 3, posterior approach to the rock-slanted region of the skull base (including posterior approach to the inferior occipital sigmoid sinus); 4, combined approach (including combined inferior temporal and posterior sigmoid sinus approach, etc.). The most commonly used approaches for tumor surgery in the oblique region of the rock include the anterior approach via the sigmoid sinus and the temporo-occipital approach via the cerebellar curtain. The temporo-occipital transcallosal approach is also suitable for resection of tumors in the rock-slope region, especially for trigeminal nerve sheath tumors that ride across the middle and posterior cranial fossa in the rock-slope region, with satisfactory results, high rates of total tumor resection and few postoperative complications. The inferior temporal transcallosal approach has a significantly smaller bone window than the anterior sigmoid sinus approach and does not require mastoidectomy and excessive exposure of the sigmoid sinus; it can simultaneously provide a more satisfactory exposure of the middle and posterior cranial fossa and a larger operating space. The length and depth of abrasion are flexible and vary according to the specific needs of the patient. The inferior temporal transcranial crest-cerebellar curtain approach retains the advantages of simple and less invasive supratentorial craniotomy, and at the same time, for meningioma, by abrading the rocky crag, the base is exposed and the blood supply to the tumor is blocked at an early stage, which makes the tumor smaller and softer and creates conditions for total resection of the tumor; for trigeminal nerve sheath tumor, the tumor can be resected in pieces by pulling only, which is better than the inferior temporal transcranial transcranial curtain approach (Kawase approach). In the case of trigeminal nerve sheath tumor, the tumor can be resected in pieces by pulling only, and the exposure to the mid-slope and lateral pontocerebellar angle is better than that of Kawase approach; it is less traumatic than the anterior joint approach to the sigmoid sinus, and it can also achieve the purpose of rock bone grinding, and the scope of rock bone grinding can be flexibly selected according to the tumor growth site, so that the base of the tumor can be treated early and the risk of surgery can be reduced. This approach increases the exposure of tumors in the mid-slope and dorsal pontocerebellar horn area of the rock bone, and is suitable for resection of almost all types of rock-slope meningiomas, which is more simple and minimally invasive than the combined approach and more in line with the development trend of skull base surgery.