【Abstract】 Mild Cognitive Impairment (MCI) is a transitional phase between normal cognitive function and dementia. Patients with MCI are at a high risk for dementia. At present, early detection, diagnosis and intervention of MCI are of great importance in reducing the incidence of dementia. This paper reviewed the recent research results of MCI, including the basic concept, etiology, pathogenesis, risk factors, diagnosis, related examination and treatment.