Alzheimer’s disease can be detected, but it needs to be diagnosed by laboratory tests combined with clinical symptoms. The main types of commonly used tests are as follows: 1. electroencephalogram. The EEG has no obvious characteristics and shows a decrease in wave amplitude and a slowing of the alpha rhythm.2. Imaging tests, often a CT of the brain or an MRI of the brain, which shows more clearly. In a typical patient with Alzheimer’s disease, MRI can reveal that the patient has bilateral temporal lobe and hippocampus atrophy.3. Neuropsychological examination. It is mainly to assess the cognitive function of Alzheimer’s patients, including memory, speech function, orientation to time, place and people, as well as spatial perception, executive function, and application ability. Roughly, it can be divided into the following scales, Simple Mental Status Examination Scale, Montreal Cognitive Test Scale, Alzheimer’s Disease Cognitive Function Evaluation Scale, Hasegawa Dementia Scale, etc. 4. Genetic testing. If the patient has a clear family history, genetic testing can also be done to help diagnose and prevent the disease in advance if mutations are found.