With the ageing of the global population, the number of communitydwelling elderly individuals with chronic diseases is increasing (Sun et al., 2019;Zhou et al., 2016). It was reported that the four most common non-communicable chronic diseases (NCDs) among elderly individuals were cancer, diabetes, cardiovascular disorders and lung disease. The four major NCDs and a handful of other chronic conditions were responsible for two-thirds of mortality globally in 2016 (Nugent, 2019). In China, the Study of Global AGEing and Adult Health (SAGE)-China Wave 1 cross-sectional study reported that half of the elderly individuals in China had at least one chronic illness (Zhao et al., 2018). In 2015, the China Family Development Report (2015) released by the National Health and Family Planning Commission showed that half of all elderly people were living without children (Croll et al., 2019), and the proportion was higher in rural areas than in urban areas; additionally, their family functioning was poor. Because of the characteristics of chronic diseases in the elderly population, such as long disease duration, difficult self-healing, complex aetiology, many complications, and high cost of treatment, coupled with retirement syndrome and other family and social factors, physical and psychological diseases are common in the elderly