To understand the self-care ability of the elderly and its influencing factors. The questionnaire on the self-care ability of the elderly is to provide the government with basic information on the current situation of the self-care ability of the elderly, so as to take more targeted medical and endowment insurance measures. Objective This study aims to understand the self-care ability of the elderly in China and its influencing factors. Questionnaire, also known as questionnaire or inquiry form, is a printed document that systematically records the contents of the survey in the form of questions.