Pair Antiplatelet THerapy in Ischemic Stroke With Intracranial Artery Stenosis

Inclusion Criteria: 1. Age 40 \~ 80 years old; 2. Patients diagnosed as non-cardiogenic cerebral infarction according to the WHO definition of stroke, with MRA/CTA/DSA confirmed intracranial artery stenosis ≥50% (intracranial carotid artery, M1 and proximal M2 segment of middle cerebral artery, A1 and A2 segment of anterior cerebral artery, P1 and P2 segment of posterior cerebral artery, intracranial vertebral artery and basilar artery); 3. First stroke onset within 7 days; 4. NIHSS score ≤5; 5. Patients or family members sign informed consent forms; Exclusion Criteria: 1. Patients receiving thrombolysis or endovascular therapy; 2. Patients with recurrent stroke; 3. Patients has undergone major surgery or major trauma within the past 30 days; 4. History of gastrointestinal bleeding, active peptic ulcer, intracranial hemorrhage or other hemorrhagic diseases; 5. Contraindications or intolerances to the use of antiplatelet therapeutics; 6. Platelet count \<100\*109/L, hemoglobin\<110g/L; 7. Patients with severe organ insufficiency or other serious disease (e.g., severe cardiopulmonary failure, advanced tumor, severe dementia); 8. Patients intolerant to MRI scan are replaced by CT or DSA; 9. poor compliance, unable to meet the requirements of the study.