As the population ages, the proportion of chronic diseases becomes more prevalent. This study aimed to investigate the current status of chronic diseases among the older people in home care (HC) and long-term care facilities (LTCFs) in China and to analyze its influencing factors. This cross-sectional study was conducted between 2021 and 2022. A multi-stage stratified random sampling and census sampling approach was used in this survey of the health of 389 older people in HC and 202 older people in LTCFs from Western Hunan, respectively. The following instruments were included in the survey "International Resident Assessment Instrument for Home Care (interRAI-HC)" and the "International Resident Assessment Instrument for Long-Term Care Facilities (interRAI-LTCF)." Univariate analysis was used to examine the prevalence of chronic diseases among older people with different characteristics. Data were analyzed by IBM SPSS version 25.0 software. A p-value of <0.05 was considered statistically significant. The survey results showed that the prevalence of chronic diseases among older people in HC was 73.26% (95% CI, 68.85-77.68), and the top five chronic diseases were hypertension (26.36%), bone and joint disease (23.36%), gastrointestinal and gallbladder disease (11.78%), heart disease (11.21%), and diabetes (8.97%). The prevalence of chronic diseases among older people in LTCFs was 77.23% (95% CI, 77.23-83.06), and the top five chronic diseases were hypertension (33.11%), bone and joint disease (13.25%), cerebrovascular disease (12.91%), diabetes (11.26%), and heart disease (10.26%). The results showed that long time spent alone, having sleep disorders, and self-rated health status significantly increased HC in older people with the prevalence of chronic diseases (p < 0.05). Having marital status, non-healthy BMI, having sleep disorder, walking with the use of assistive devices, and self-rated health status significantly increased older people in LTCFs with the prevalence of chronic diseases (p < 0.05). There are differences in the prevalence and distribution of chronic diseases among older people in two different aged care models in China, and there are various risk factors for chronic diseases. Therefore, chronic disease healthcare strategies should be tailored to two different aged care models for older people. Further summary found that older people in HC spend a lot of time alone and suffer from loneliness, which ultimately causes psychological disorders. Thus, psychological adaptation interventions are needed for older people in HC. Besides, older people in LTCFs lack social support from their families (divorced/widowed) and have activity disorders (walking with the use of assistive devices). Thus, social adaptation interventions are needed for older people in LTCFs. This study provides a theoretical basis for the distribution of healthcare and the prevention and treatment of chronic diseases in Chinese older people.