Digital subtraction angiography (DSA), i.e., angiographic images are digitally processed to remove unwanted tissue images and retain only vascular images. It provides the necessary conditions for various interventional treatments. It is mainly applicable to the examination and treatment of systemic vascular diseases and tumors. The application of DSA for interventional treatment has opened up a new field for the diagnosis and treatment of cardiovascular diseases. With the rapid development of neurointerventional radiology technology and the clinical application of new interventional materials, intravascular interventional technology has become one of the main methods for the treatment of acute ischemic cerebrovascular disease. dsa is considered the gold standard for the diagnosis of ischemic cerebrovascular disease. the application of dsa technology has significantly improved the detection rate of cerebral vascular disease and provided a good platform for interventional treatment. DSA equipment provides a good platform for its interventional examination and treatment. The interventional examination and treatment of acute ischemic cerebrovascular disease is performed under DSA equipment. First, a catheter is placed into the target vessel under X-ray fluoroscopy, and DSA images are acquired through a predefined image acquisition program to complete the interventional examination. Then, according to the results, interventional treatment is performed on the diseased vessel under DSA guidance, and after the treatment is completed, the DSA equipment is applied to evaluate the interventional treatment effect. The application of DSA perfusion imaging can help rapid diagnosis of acute ischemic cerebrovascular disease and evaluation of interventional efficacy DSA perfusion imaging can generally depict the distribution of blood supply to the brain, brain parenchymal staining and abnormal changes, objectively evaluate the situation of acute cerebral ischemia, and can quickly detect ischemic responsible vascular lesions and buy time and provide an important basis for interventional treatment. In normal population, because the bilateral carotid arteries and bilateral vertebral arteries supply sufficient blood supply to the corresponding parts of the brain, and give full play to the regulating role through the basilar artery ring when the cerebral hemodynamics are changed, generally the parenchymal phase of the brain shows uniform staining, rich blood supply and no ischemic changes on DSA cerebral perfusion images. Since cerebral ischemia is manifested as different degrees of lighter staining on DSA cerebral perfusion images, the lighter the staining, the more severe the ischemia, and the site and degree of cerebral ischemia can be determined based on this. In the process of acute ischemic cerebrovascular disease emergency intervention, rapid diagnosis should be made according to the characteristics of the disease course and the requirements of interventional treatment. We should strive to get timely and effective interventional treatment within the effective time window. In order to achieve the above purpose, the reasonable use of DSA equipment is particularly important. the role of DSA equipment in the interventional treatment of acute ischemic cerebrovascular disease In comparative imaging, ultrasound, CTA, MRA and other examination means play a non-negligible role in the initial diagnosis of cerebrovascular disease. Although cerebrovascular ultrasonography is a noninvasive examination, its results are affected by the operator’s technique and experience, which may produce certain errors; MRA sometimes produces artifacts due to the influence of the machine field strength and operator experience, etc. CTA has been more and more widely used in recent years, but it is affected by the computer image reconstruction equipment software and operator experience, which sometimes also produces certain errors. DSA injects non-ionic iodine contrast agent into the target vessel through catheters and other interventional materials according to the normal blood flow rate of the vessel, and acquires the corresponding arterial, capillary, venous and sinus images according to the blood circulation characteristics of the cerebral vessels, which are digitally subtracted and processed by computer to produce DSA images. DSA images are considered the gold standard for diagnosing cerebrovascular disease because of their ability to truly reproduce information on the morphology, structure, circulation time, site and degree of stenosis, size and location of emboli, and ischemic compensation. Ji Xunming, Department of Neurosurgery, Xuanwu Hospital, Capital Medical University