The Study of Jian Pi Yi Shen Hua Tan Granules in Cognitive Impairment After Acute Cerebral Infarction

Inclusion Criteria: * Patients conform to the diagnostic criteria of acute ischemic stroke Online Certificate Status Protocol classification of cerebral infarction : Partial Anterior Circulation Infarct, Posterior Circulation Infarct or Lacunar Infarction - Stroke onset within 14 days * Neuropsychological assessments: Montreal Cognitive Assessment Scale scores less than 26 points or scores less than 27 points，MMSE scores range from 19 points to 26 points * Age from forty to eighty, gender not limited * Informed and signed the informed consent Exclusion Criteria: * Transient Ischemic Attack * Online Certificate Status Protocol classification of cerebral infarction is a total anterior circulation infarction * Stroke patients with the causes of cerebral hemorrhage, subarachnoid hemorrhage, brain tumors, brain injury, or blood diseases and so on. * Stroke with an onset of more than 14 days * Cerebral embolism caused by atrial fibrillation resulted from rheumatic heart disease, coronary heart disease and other heart diseases. * Patients who cannot cooperate with the check due to serious visual, hearing dysfunction, apraxia, aphasia. * Patients with other neurological diseases which can affect cognitive function (for example: severe Parkinson's disease, normal pressure hydrocephalus, brain tumors, encephalitis) * Patients with communication difficulties, or psychiatric disease * Depression (Hamilton Depression Scale scores more than or equal to 17 points) Diagnosed with alcohol or drug dependence within the past six months * With other diseases which can cause cognitive dysfunction, Such as thyroid dysfunction, severe anemia, syphilis, Human Immunodeficiency Virus and so on * With a previous history of stroke and serious sequelae, and cannot cope with neuropsychological examination * With severe primary diseases, and cannot comply with the above scheme