Inclusion Criteria:  1. 18-80 years old (contains 18 and 80 years), with no limit for both sexes; 2. Acute internal carotid artery was diagnosed according to the Chinese guidelines for the diagnosis and treatment of acute ischemic stroke (2014) Cerebral infarction of the arterial system (anterior circulation), well after first onset or last onset (MRS score 0-1) patients; 3. Onset ≤ 48 hours (onset to randomization within 48 hours); 4. 5 points ≤ NIHSS ≤ 25 at presentation; 5. Informed consent was signed by the patients or their legal surrogates.  Exclusion Criteria:  1. Patients with recurrent cerebral infarction with pre Mrs score ≥ 2 at this time; 2. Cranial CT suggestive of intracranial haemorrhagic disease (e.g Intracranial hematoma, intraventricular hemorrhage, subarachnoid hemorrhage, etc.); 3. Cerebral infarction with impaired consciousness (NIHSS score of 1A items ≥ 1), transient ischemic attack Zuo, cerebral arteritis, brain tumor, brain trauma, intracranial infection, cerebral parasite disease patients; 4. Patients who have undergone or require interventional, thrombolytic, and defibrillation therapy after this episode; 5. History or evidence of any one of the following diseases during the screening period:  poorly controlled hypertension with systolic blood pressure ≥ 200mmhg or diastolic blood pressure ≥ 110mmhg during screening period;