Study purpose: A multicenter, prospective and randomized study is planned to compare the clinical outcomes of carotid artery stenting via brachial artery access and femoral artery access. Eligible participants will be randomly assigned 1:1 to the brachial artery group or the femoral artery group. Primary endpoint: surgical success rate. Secondary endpoints: 1. Operation time (time from first arterial puncture to last angiography) 2. Serious adverse events (SAE) within 90 days; 3. Access puncture complications;