Efficacy and Safety of Butylphthalide Soft Capsule for the Treatment of Vascular Dementia

Inclusion Criteria: * 1\. Age ≥50 and ≤75, male or female. * 2\. The subjects must have completed primary school education or above, and be able to complete the cognitive ability test and other tests required by the program. * 3\. Meet the vascular dementia diagnosis criteria specified in the Diagnostic and Statistical Manual of Mental Disorders - 5th Edition (DSM-V). * 4\. Meet the SIVD diagnosis criteria of Erkinjuntti. * 5\. MRI supports the existence of an ischemic cerebrovascular disease; Meet the National Institute of Neurological Disorders and Stroke (NINDS-AIREN) imaging diagnosis criteria; The lesion located between supra-tentorial and subcortical areas; The maximum diameter of the infarction ≤30mm; The number of infarctions ≥3, and/or Fazekas score=2-3. * 6\. The patients need to be enrolled 3 months after the last stroke, if there is a clear history of stroke; otherwise meet other Criteria. * 7.The subjects are suffering from mild or moderate vascular dementia, with 11≤ MMSE ≤26, and the Clinical Dementia Rating (CDR) score 1≤ CDR ≤2. * 8\. The Hamilton depression scale (HAMD) total score ≤17. * 9\. The patient agrees to participate in this study and the patient or his or her legal guardian has signed the informed consent before the study. * 10\. The subjects must have a care giver who has completed primary school education or above. The MMSE score of the care giver should be within the following range: education level of primary school \> 20 points, education lev…