Abstract: Objective To examine the prevalence and influencing factors of mild cognitive impairment(MCI) among aged people in the communities of Tianjin city,and to provide evidence for early diagnosis and intervention of the disease.Methods Totally 2 978 people over 65 years old from six communities in Tianjin were selected with cluster random sampling method and investigated on health status with a questionnaire survey and screened for MCI with Mini-Mental State Examination(MMSE),Activity of Daily Living scale(ADL),and Global Deterioration Scale(GDS) according to the standard of Diagnostic and Statistical Manual of Mental Disorders Ⅳ(DSM-Ⅳ).Results The overall MCI prevalent rate was 11.38% among the elderly.The prevalence of MCI were significantly different among the elder persons of different age,gender,education level,marital status,monthly household income,smoking,whether living alone,reading newspaper and doing household duties frequently,and whether with diseases of hypertension,hyperlipemia,diabetes,or depressive disorder(P<0.01 for all).While the prevalence of MCI among the elderly had no significant relationship with occupation history of the elderly(P>0.05).Multiple logistic regression analyses showed that the aged,female,smoking,living alone,having hypertension,hyperlipemia,diabetes,or depressive disorder were risk factors for MCI,while high educational level,married,high monthly household income,reading newspaper,and doing household duties frequently were the protective factors of MCI.Conclusion This study confirms the high prevalence of MCI among the community elderly aged over 65 years in Tianjin city.Age,gender,education level,marital status,monthly household income,smoking,living alone,reading newspaper,doing household duties frequently,and having hypertension,hyperlipemia,diabetes,or depressive disorder are major influencing fators of MCI.