Inclusion Criteria:
1. Age 18 to 80 years old;
2. Symptomatic intracranial artery stenosis, the diameter of the target vessel measured by intracranial angiography was between 70 and 99% (WASID method);
3. The stenosis vessels were in internal carotid artery (intracranial segment), middle cerebral artery, basilar artery, vertebral artery (intracranial segment);
4. The patient had at least one risk factor for intracranial atherosclerosis, including past or existing hypertension, hyperlipidemia, diabetes, smoking, etc.;
5. mRS≤2 before enrollment;
6. 1.25mm≤ target vessel diameter ≤4.5mm;
7. Intracranial artery stenosis requiring interventional treatment was a single lesion;
8. Patients or their guardians can understand the purpose of the trial, voluntarily participate and sign a written informed consent, and can accept follow-up.
Exclusion Criteria:
1. The target vessel is severely calcified and distorted, and the interventional instruments are difficult to be in place or recovered;
2. Acute ischemic stroke occurred within 2 weeks before surgery;
3. Cerebral hemorrhage occurred 3 months before surgery;
4. The target lesion has been treated with interventional therapy before;
5. Intracranial artery stenosis caused by non-atherosclerotic lesions;
6. Intracranial aneurysm or intracranial arteriovenous malformation with an unpredictable high risk or risk of bleeding;
7. Risk factors that may contribute to the risk of cardiogenic embolism (such as left ventricular thrombosis, myocardial infarction within 1 month);
8. History of gastrointestinal bleeding within 6 months;
9. Coagulation dysfunction or obvious bleeding tendency (such as INR \> 1.5);
10. Known allergy to contrast agents, anticoagulants, anesthesia and other drugs, red light;
11. Platelet count (PLT\<90×109/L);
12. Hemoglobin \<100g/L; Uncontrolled severe hypertension (persistent: systolic \>180mmHg or diastolic \>110mmHg);
(14) Creatinine \>3mg/dL, i.e. \>265μmol/L; (15) Serious dysfunction of important organs such as heart, liver and kidney; (16) Those who are participating in clinical trials of other drugs or devices that do not meet the primary endpoint; (17) Women who are pregnant or breastfeeding, or who plan to pregnant within one year; (18) Life expectancy is less than 1 year; (19) The researcher determined that there were other circumstances that were not suitable for inclusion.
