基于中国家庭追踪调查2020年调查数据，运用最小二乘法回归模型和倾向性得分匹配研究短视频使用对中老年人幸福感的影响，并进一步考察人缘关系在短视频使用与中老年人幸福感关系中的中介效应。研究发现：短视频使用可以显著提高中老年人的幸福感；人缘关系在其中起着部分中介作用。为了发挥短视频在中老年人中的积极影响，可通过增强平台适老性、拓宽互动渠道、强化平台治理等方式促进短视频平台的健康发展，提高中老年群体的网络参与，为积极老龄化提供新媒体支持。

Based on the 2020 China Family Panel Studies survey data, in this study ordinary least square regression models and propensity score matching were employed to examine the impact of short video usage on the sense of happiness among middle-aged and elderly individuals. Additionally, the mediating effect of social relationships in the relationship between short video usage and the sense of happiness was investigated. The findings reveal that short video usage significantly enhances the sense of happiness among middle-aged and elderly individuals, with social relationships partially mediating this relationship. To harness the positive influence of short video platforms on this demographic, promoting the healthy development of these platforms by enhancing their elderly-friendliness, expanding interactive channels, and strengthening platform governance can facilitate greater online engagement among middle-aged and elderly individuals and provide new media support for active aging.