数字技术的普及正深刻重塑中老年群体的媒体信任结构。本文基于驯化理论，利用2021年中国社会状况综合调查数据，实证检验了网络社群对我国中老年人媒体信任的影响及其异质性，并深入分析了影响机制及不同类型网络社群影响的差异性。研究发现：第一，网络社群参与显著削弱了中老年人对媒体的信任，这一负向效应因年龄增长、代际支持缺失而增强，但社交网络可缓解其影响；第二，技术驯化通过“制度性权威解构”与“信任补偿关系重构”双重路径发挥作用，前者以政治信任下降为中介加剧媒体信任流失，后者通过社会评价提升媒体信任，形成部分遮掩效应，揭示了权威稀释与关系增生的认知调适特征；第三，不同类型网络社群存在差异性影响，功利性社群显著消解媒体信任，而关系性与兴趣性社群对媒体信任则无显著作用。研究表明，中老年人的媒体信任重构并非线性替代，而是制度性权威与关系性信任动态博弈的结果，凸显了技术驯化进程中算法逻辑与社会逻辑的辩证互动对媒介信任体系建构的重要影响。

The prevalence of digital technology is profoundly reshaping the media trust structure of middle-aged and elderly people. Based on the theory of technology domestication and using data from the 2021 China Social Survey, this study empirically examines the impact of online communities on media trust among middle-aged and elderly people in China, as well as its heterogeneity. It also delves into the underlying mechanisms and the differential impacts of various types of online communities. The study finds that: firstly, online communities participation significantly weakens trust in media among middle-aged and elderly people, and this negative effect intensifies with age and the absence of intergenerational support, but social networks can mitigate this effect. Secondly, technology domestication operates through dual pathways of “institutional authority deconstruction” and “trust compensation relationship reconstruction”. The former, with the decline of political trust as an intermediary, intensifies the loss of media trust, while the latter improves media trust through enhanced social evaluation, forming a partial masking effect revealing cognitive adaptation characteristics of authority dilution and relationship proliferation. Thirdly, there are differential impacts among types of online communities, with utilitarian communities significantly eroding media trust, whereas relational and interest-based communities have no significant effect on media trust. The findings suggest that media trust reconstruction among middle-aged and elderly people is not a non-linear replacement, but rather the result of a dynamic game between institutional authority and relational trust, highlighting the important impact of the dialectical interaction between algorithmic logic and social logic on the construction of media trust systems in the process of technological domestication.