The examination of cerebral infarction includes imaging examination, laboratory examination, vascular ultrasonography other examination and so on. 1. Imaging examination: including CT examination, magnetic resonance examination, imaging and so on. Cerebral infarction is manifested as low-density infarct foci in CT; MRI can clearly show early ischemic cerebral infarction, with infarct foci showing low signal in T1 and high signal in T2; digital subtraction angiography is the gold standard for the examination of cerebral vascular lesions, but invasive operation carries certain risks. Magnetic resonance angiography and CT angiography can also detect stenosis, occlusion or other vascular lesions, such as arteritis, aneurysm, arteriovenous malformation, etc., which can provide the basis for endovascular treatment of cerebral infarction. 2. Laboratory examination: including blood glucose, blood lipids, homocysteine, platelet aggregation rate, coagulation, etc. Through biochemical and laboratory examination, it can provide the basis for the diagnosis of the underlying disease of cerebral infarction. 3. Vascular ultrasonography: including carotid ultrasonography and transcranial Doppler ultrasonography, which can detect intracranial and extracranial vascular lesions, especially helpful in detecting vascular stenosis and plaque. 4. Other examinations: echocardiography, for example, can detect suspected sources of emboli such as cardiac appendage thrombus, atrial mucocele, mitral valve prolapse, and so on. Patients with cerebral infarction should go to the hospital in time and receive standardized treatment under the guidance of doctors.