Establish a clinical database of AD patients in China Lead Investigator: Feng Zhou Institution : Peking University E-Mail : zhoufeng_pk@163.com Proposal ID : 1358 Proposal Description: To analysis the demographic characteristics of AD patients and study the influencing factors of disease progression, Is also provide the guidance for development of AD cohort study in China. Project will not utilize NACC forms, but data collection points will be used for guidance in development of study.