How angioplasty and stenting of carotid stenosis is performed is unknown not only to most patients, but also to many physicians, including many neurological specialists. By briefly describing the procedure, this article will hopefully provide the reader with an initial visualization of the procedure. 1. The patient to be treated is brought to the interventional room. 2.The proposed puncture site (commonly bilateral inguinal area) is routinely disinfected, a cavity towel is laid, and the puncture area is locally anesthetized. 3.The Seldinger method is used to puncture the artery (mostly the femoral artery), and a vascular sheath (about 2-3 mm in diameter, a channel for imaging and guiding the catheter) is placed. 4.The guiding catheter (the catheter through which the interventional device is passed) is passed through the vascular sheath, and under the guidance of the guidewire, the catheter is entered into the carotid artery, and the tip of the guiding catheter is placed near the proximal end of the carotid stenosis. 5, Through the guiding catheter, the umbrella (to prevent the flow of thrombus dislodged from the stenosis into the brain) is released along the micro-guide wire, through the carotid stenosis site, and placed distal to the stenotic segment of the carotid artery. 6.If the stenosis is severe, a smaller balloon is placed along the micro-guide wire at the carotid stenosis, dilated (pre-dilated) by a pressure pump, and the balloon is withdrawn. 7. Based on the measured data, an appropriately sized carotid artery stent is placed along the micro-guide wire at the carotid stenosis, positioned and released. 8, Re-imaging suggests that the stenosis is basically corrected (complete opening of the stenosis is not required), and the stent delivery system is withdrawn. 9.If the stenosis is still heavy, place a slightly larger balloon along the micro-guide wire at the carotid stenosis after stenting, dilate by pressure pumping (post-dilation), and withdraw the balloon. 10, Re-imaging suggests that the stenosis is basically corrected (complete opening of the stenosis is not required), and intracranial angiography is performed. 11.Exit the protective umbrella and catheter system. After confirming that the patient has no uncomfortable symptoms, pull out the vascular sheath, apply pressure to the puncture site and observe the condition. 12.Surgery is completed. The whole procedure continues from half an hour DDD according to the degree of difficulty.