In Alzheimer’s disease（AD）is one of the most common cause of Alzheimer’s disease. However，there is still no effective treatment for AD. Individuals with subjective cognitive decline（SCD）is considered as a promising target population for AD prevention. Therefore，understanding the public’s awareness of AD and SCD is crucial for further education and treatment strategy development. We designed and distributed the questionnaire titled “the awareness rate and subjective visit rate for AD and SCD in China” based on the online method. The results showed that in the whole cohort，the awareness rate of AD was 97.08%，the awareness rate of SCD was 82.63%，and the proportion of deciding to look for medical help was 78.17%. At present，the public’s understanding of AD and SCD has been significantly improved，but the depth of their understanding still needs to be improved. More work is needed to increase the public’s attention to AD and SCD，and promote the early prevention and treatment of AD.