[Conducting systematic researches on influencing factors for healthy ageing and promoting scientific implementation of health promotion program for the elderly].

With the worsening of population ageing in China, the life quality of the elderly is deeply affected by comorbidity, disability, dementia and psychological problems. In China, great achievements have been made in the research of healthy ageing, but due to limitations in research hypothesis, sample size, study design and quality of follow-up, the research findings are insufficient to provide high-quality evidence chain or can't be adopt in health guidelines or standards for the elderly in China, especially the oldest-old. In this special issue, the team of Healthy Aging and Biomarkers Cohort Study reported a series of new findings on health pattern of the elderly, influencing factors and biomarkers in healthy ageing research to provide more comprehensive scientific evidences for health service and to support scientific implementation of health promotion program for the elderly and promote healthy ageing.