Using data from 1,484 participants in the Chinese Social Survey (CSS), we analyzed the relationships among internet use, social trust, volunteer engagement, and life satisfaction. Our findings indicate that greater internet use correlates with enhanced older adults' life satisfaction. Volunteering positively mediates the relationship between internet use and life satisfaction. Furthermore, social trust moderates the relationship between internet use and volunteering. Internet use and social trust are significant factors affecting volunteering and life satisfaction among older Chinese adults. Policymakers should foster equitable internet access and support initiatives that encourage online engagement and build trust among older adults.

Keywords: Internet use; life satisfaction; older adults; social trust; volunteering.

使用来自1,484名中国社会调查（CSS）参与者的数据，我们分析了互联网使用、社会信任、志愿服务和生活满意度之间的关系。研究结果表明，更多的互联网使用与老年人的生活满意度提高有关。志愿服务积极地介导了互联网使用和生活满意度之间的关系。此外，社会信任调节了互联网使用和志愿服务之间的关系。对于中国老年人来说，互联网使用和社会信任是影响志愿服务和生活满意度的重要因素。政策制定者应促进公平的互联网接入，并支持鼓励线上参与和建立老年群体之间信任的倡议。

关键词： 互联网使用；生活满意度；老年人；社会信任；志愿服务。