With the aggravation of worldwide population aging,Alzheimer's disease (AD) has been an enormous impact on public health nowadays.Previous studies showed the incidence of AD has been declining in some high-income countries over three decades,which may be associated with improvement of living environment,education and medical care conditions.Therefore,evaluation risk factors of AD and take corresponding preventive measures has become an urgent problem to delay the occurrence and progress of AD.The mainly non-modifiable risk factors including age,gender,family history of genetic disease and genetic factors.Several modifiable risk factors are also confirmed to increase risk of AD occurrences,such as low education,hypertension and obesity in mid-life,diabetes mellitus,less physical activity,current smoking and depression.Various existing risk models for identifying individuals with high risk of AD have been developed in order to open new doors for targeted prevention.