Patients with arteriovenous malformations develop epilepsy due to localized ischemia in the brain caused by arteriovenous short-circuiting, glial-like changes in adjacent brain tissue, and the ignition effect of temporal lobe arteriovenous malformations. The phenomenon of arteriovenous short circuit needs to be differentiated from other cerebrovascular malformations, smoker’s disease, primary epilepsy, and intracranial aneurysms. The phenomenon of arteriovenous short circuit needs to be distinguished from other cerebrovascular malformations, smoker’s disease, primary epilepsy, intracranial aneurysm, etc. Cerebral cavernous hemangioma is also a common cause of recurrent subarachnoid hemorrhage in young people. Patients often have no obvious clinical symptoms before hemorrhage. The cerebral angiogram is often negative or appears pathological vascular mass, but no thickened blood supply artery or dilated drainage vein can be seen. However, surgical excision and pathological examination are finally required to differentiate it from arteriovenous malformation. The primary epilepsy is often seen in arteriovenous malformations of the brain, and thrombosed arteriovenous malformations are more likely to have intractable seizures, which are often not visualized by cerebral angiography and are often misdiagnosed as epilepsy. However, primary epilepsy is commonly seen in children, and arteriovenous malformations should be considered in young adults with epilepsy and subarachnoid hemorrhage or epilepsy appearing after subarachnoid hemorrhage. In addition, patients with arteriovenous malformations have other signs and symptoms besides epilepsy, such as headache, progressive mild hemiparesis, ataxia, visual impairment, etc. CT scan can help in differential diagnosis. Cerebral aneurysm is the most common cause of subarachnoid hemorrhage, and the age of onset is about 20 years older than that of cerebral arteriovenous malformation, i.e., it is more common in 40 to 50 years old and in women. Patients often have a history of hypertension and atherosclerosis. Seizures are rare and arterial nerve palsy is common. It is not difficult to identify according to cerebral angiography. 4. Venous vascular malformations are less common and sometimes can rupture and bleed causing subarachnoid hemorrhage and increased intracranial pressure. The cerebral angiogram does not show obvious malformed vessels, and sometimes only a thick vein with some drainage branches is seen. 5, smog disease This disease is mostly seen in children and young adults, children with cerebral ischemia as the main manifestation, adults with intracranial hemorrhage as the main symptom. The definite differential diagnosis depends on cerebral angiography. The cerebral angiogram of smoker’s disease shows narrowing or occlusion of the internal carotid artery and a cloudy, slim, abnormal vascular mass at the base of the brain. 6.Brain tumors with rich blood supply Cerebral arteriovenous malformations still need to be differentiated from gliomas, metastases, meningiomas and hemangioblastomas with rich blood supply. Since these tumors have rich blood supply, the traffic between arteries and veins and the early appearance of veins can be seen in cerebral angiography, so they can be confused with cerebral arteriovenous malformation. However, it is not difficult to differentiate them according to age of onset, medical history, disease duration, clinical symptoms and signs, etc. CT scan can help to clarify the differential diagnosis.