Inclusion Criteria:  Age 18 to 80 years; Subject has solitary symptomatic intracranial atherosclerosis that the degree of the artery stenosis is between 70% and 99% diagnosed by angiography； The target artery locates in Vertebral Artery(VA), Internal Carotid Artery(ICA), Middle Cerebral Artery(MCA) or Basilar Artery(BA); Subject has at least two atherosclerosis risk factors including diabetes, history or present hypertension, hyperlipidemia, smoking, age>45； Modified Rankin Scale(mRS) score≤2 before enrollment; Subject or legal representative is able to understand the purpose of study, agrees to to provide follow-up data and has provided written informed consent;  Exclusion Criteria:  History of severe ischemic stroke within 2 weeks； History of intracranial hemorrhage(including intraparenchymal hemorrhage, massive subarachnoid hemorrhage, subdural hemorrhage and epidural hemorrhage) within 3 months; Hypertension uncontrolled by medicine(Systolic pressure≥180 mmHg or diastolic pressure≥110mmHg continuously); Associated intracranial arteriovenous malformation, aneurysms or tumors; The length of the target vessel>10mm and acute angle>90°; History of stent intervention within the target vessel; Allergic to heparin, sirolimus, contrast agents, aspirin, clopidogrel, anesthetics； History of gastrointestinal hemorrhage within 6 months before providing informed consent or unable to receive antiplatelet therapy； Platelet(PLT)<90*10^9/L; Creatinine>250umol/L; International Normalized Ratio(INR)>1.5; Expected life <12 months; Female subjects who are pregnant, having a pregnancy plan, or lactating within the study period; Unable to cooperate with or tolerate the interventional surgery; Subjects who have participated in other clinical investigations or haven't reach the primary end point; Intracranial artery stenosis caused by arterial dissection, arteritis, and thrombosis; Unsuitable tortuous artery for delivery, deployment and retrieval of the device; The degree of stenosis within the non-responsibility vessels>70%; Other circumstances judged by researchers that are not suitable for enrollment;