1, questionnaire survey: you can design a questionnaire for the health of the elderly, through face-to-face surveys or online surveys of the elderly, to understand their health status, lifestyle, disease history and other aspects of the situation.

2. Observation survey: It can be done by observing the living environment, dietary habits, exercise and other aspects of the elderly to understand their health status and lifestyle.

3, medical file survey: can be through the access to the medical file of the elderly, to understand their history of disease, medication, physical examination reports and other aspects, so as to understand their health status.