This study is designed to evaluate the effects of an oriental herbal medication namely Bojungikki-tang-gamibang on vascular dementia. The Clinical data was analyzed on a patient with vascular dementia due to deficiency of Spleen Gi, whose symptoms were dementia, Rt. side hemiparesis, insomnia, anorexia et al. The patient visited at the internal medicine department of Daegu Haany University affiliated Kumi Oriental Hospital on February 14, 2008 to March 28, 2008. The improvement of symptoms were checked by Mini Mental Status Examination-Korea(MMSE-K). After treatment, dementia, Rt. side hemiparesis, insomnia, anorexia got improved and MMSE-K score increased as well. This study suggests that Bojungikki-tang-gamibang is significantly effective in treatment of vascular dementia.