The process of cerebral angiography can be divided into preoperative examination, operation process, postoperative precautions and so on. 1. Preoperative examination: before the angiography, patients need to undergo electrocardiogram, chest X-ray, liver and kidney function, electrolyte, coagulation function, infectious quadruple test, etc. In case of abnormality of the relevant examination, it may be necessary to postpone the angiography procedure. 2. Operation process (1) Aseptic surgical operation should be performed, including the operator wearing a cap and mask, brushing and sterilizing hands, and wearing a sterile surgical gown. (2) Seldinger arterial cannulation technique is routinely sterilized and toweled, femoral artery puncture is performed under local anesthesia, the puncture needle is gently pushed along the lumen of the artery for 1~2cm, the guidewire is introduced and then withdrawn from the puncture needle, the catheter sheath is fed through the guidewire, and the catheter sheath is secured, and then the catheter sheath is withdrawn with the dilatation tube. (3) Insert a contrast catheter through the catheter sheath (the catheter is filled with heparinized saline) and feed the catheter into the left and right internal and external carotid arteries and the vertebral artery (the arteries can also be inserted according to the specific requirements) under fluoroscopic vision, and inject a small amount of contrast medium to confirm the location of the catheter head end. (4) Connect the catheter to a high-pressure syringe for imaging and filming. 3. Postoperative precautions (1) After the operation, the puncture site should be sufficiently compressed to stop bleeding (usually 10-15 minutes), and the local pressure bandage should be applied for 12 hours after the bleeding stops; or the vascular sealer should be applied to stop bleeding. (2) Brake the lower limb on the puncture side for 4 to 12 hours. (3) Monitor blood pressure, dorsalis pedis arterial pulsation of the lower limb, and the condition of the inguinal puncture site. Those who have the need for cerebral angiography are advised to consult a neurointerventionalist.