Although mild cognitive impairment associated with Parkinson disease does little effect on the basic living functions of patients， it often leads to Parkinson disease dementia， which significantly affects the quality of life and prognosis of patients. Therefore， it is of great significance to understand this disease and make early intervention. This article reviews the definition， clinical phenotype， diagnostic criteria， differential diagnosis， pathogenesis， risk factors and the treatment of mild cognitive impairment in Parkinson's disease， so as to provide references for relevant studies.