نبذة مختصرة : Background In recent years, in the context of global aging, the number of patients with chronic diseases in China has increased significantly, and the the coexistence of multiple diseases has become more and more common, which seriously threatens the life safety and quality of life of the older adults in China. Objective To investigate the status of multimorbidity of older adults, and explore the relationship and pathways of action between sleep, physical activity, social network and multimorbidity of older adults, providing ideas for the effective prevention of multimorbidity and health improvement of older adults. Methods Elderly people aged≥60 years in the Community Health and Behavior of the Elderly Panel Study (CHBEPS) established by our team in 2021 were selected as the subjects of the survey, a questionnaire was used to investigate the study population, the research objects were investigated by questionnaire, and the general situation was collected by self-designed basic information collection form, IPAQ-S-C, LSNS-6 and PSQI were used to assess the physical activity, social network and sleep of the subjects. AMOS 28.0 statistical software was used to set up the structural equation model. Results A total of 3 392 valid questionnaires were collected from 3 531 people over 60 years old, with an effective recovery rate of 96.06%. The average score of physical activity was 2 426.42 (495.00, 3 060.00) MET-min/w, the average score of social network was (15.91±6.43), and the average score of sleep was (5.49±3.53). There were 788 (23.23%) older adults with insufficient social network and 353 (10.41%) older adults with fair or very poor sleep quality. The prevalence of multimorbidity among the survey respondents was 41.13% (1 395/3 392). The results of correlation analysis showed that social network was negatively correlated with sleep level (rs=-0.113, P
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