Alzheimer’s disease, also called Alzheimer’s disease, is the most common type of dementia in the early stages of aging and tends to develop around age 65. In the early stages it is difficult to be detected by family members, and even when symptoms appear, they are relatively mild. In the late stage, the symptoms are more typical and can be easily detected. First, patients with dementia first manifested as memory loss, especially in the early stage, mainly in the recent memory loss, manifested as for daily things or contact with things are easily forgotten, lost. Secondly, it is visuospatial impairment, which is manifested by patients not being able to find the door of their home after going out, or not being able to find their room after going to the toilet at home. Thirdly, it is the problem of language function, some patients may have aphasia, dysarthria, dyscognition and so on. Fourthly, there are problems in comprehensive analysis and logic ability. Fifthly, there is a change in personality and behavior. In the early stage, there is a possibility of depression, short-temperedness, irritability, and so on. In the late stage, patients may become unclean, unkempt, and urinate and defecate anywhere, and some patients may even have crying and laughing disorder, combined with coma and so on.