随着社会信息及网络技术的发展的快速发展，短视频作为社交媒体及信息传播媒介中具有鲜明特征的一种形式受到大众青睐。短视频及短视频中普遍存在信息茧房效应（本质是信息同质化）对人们的心理健康产生的影响日益凸显。但现有研究尚未涉及短视频使用行为（关注人数和日均使用时长）、信息同质化（信息呈现同质化和信息获取同质化）和主观幸福感三者之间相互作用机制的探究。本研究基于选择接触理论、使用满足理论和主观幸福感理论，运用调查问卷和追踪测量等方法验证信息同质化在短视频使用对主观幸福感影响中的中介效应。研究一通过线上问卷平台，收集了2000名参与者短视频使用行为（关注人数和日均使用时长）及主观幸福感的问卷数据。研究结果发现短视频关注人数和日均使用时长都能够显著正向影响主观幸福感。在此基础上，研究二为了能够确认研究结果的稳健性，研究人员对同一批被试进行了追踪测量，收集到807名参与者的短视频使用行为、主观幸福感的问卷数据。通过对短视频关注人数和主观幸福感数据进行交叉滞后分析，研究结果显示只有短视频关注人数对主观幸福感的影响存在稳定性和同步性。短视频日均使用时长不能够稳定地对主观幸福感产生影响。据此，研究人员排除了短视频日均使用时长作为短视频使用行为变量进行后续研究。在研究一和研究二的基础上，研究三对收集到807名参与者短视频关注人数、主观幸福感、信息呈现同质化和信息获取同质化的问卷数据开展研究，验证短视频信息呈现同质化和信息获取同质化在短视频关注人数对主观幸福感产生影响中的中介效应。研究结果显示信息呈现同质化和信息获取同质化在短视频关注人数对主观幸福感影响中的中介效应均为显著且为部分中介效应。研究人员继续进行中介效应的追踪研究，研究四收集追踪到547名参与者的问卷数据。运用半中介交叉滞后模型进行分析，结果显示只有信息呈现同质化在短视频关注人数对主观幸福感的影响中呈现稳定且同步的中介效应。通过本研究，研究人员确认了短视频关注人数对主观幸福感的双向影响关系及信息呈现同质化在该影响中的中介效应，拓展了新闻传媒与心理学交叉研究的广度，且纵向追踪的研究方法的应用推进了研究深度。研究过程和研究结果为短视频应用研究提供了可借鉴的范式，同时为其他手机应用程序的使用行为研究提供了量化研究的模型。

With the rapid development of social information and network technology, short videos are favored by the public as a form of social media and information dissemination media with distinctive features. The impact of short videos and the information cocoon effect (essentially information homogenization) prevalent in short videos on people‘s mental health has become increasingly prominent. However, existing studies have not yet explored the interaction mechanisms among short video usage behavior (number of followers and average daily usage hours), information homogenization (information presentation homogenization and information access homogenization) and subjective well-being. Based on the theory of selective exposure, the theory of use satisfaction and the theory of subjective well-being, this study uses questionnaires and tracking measurements to verify the mediating effect of information homogenization in the impact of short video use on subjective well-being.Study 1 collected questionnaire data on short video usage behavior (number of followers and average daily usage hours) and subjective well-being from 2000 participants through an online questionnaire platform. The results of the study found that both the number of followers and the average daily duration of use of short videos can significantly and positively affect subjective well-being. On this basis, in order to confirm the robustness of the findings, the researchers conducted follow-up measurements on the same group of subjects and collected questionnaire data on short video usage behavior and subjective well-being from 807 participants. Through cross-lagged analysis of the number of short video followers and subjective well-being data, the results of the study showed that only the number of short video followers had stability and synchronization on the effect of subjective well-being. The average daily use time of short videos could not have a stable effect on subjective well-being. Accordingly, the researchers excluded short video average daily use duration as a short video use behavioral variable for subsequent research.On the basis of Studies 1 and 2, Study 3 conducted a study on the questionnaire data collected from 807 participants on the number of short video followers, subjective well-being, information presentation homogeneity and information access homogeneity, to verify the mediating effect of short video information presentation homogeneity and information access homogeneity in the impact of the number of short video followers on subjective well-being. The results of the study show that the mediating effects of information presentation homogeneity and information access homogeneity in the influence of the number of short video followers on subjective well-being are both significant and partially mediated. The researchers continued to conduct a follow-up study of the mediating effect, and Study 4 collected questionnaire data that tracked 547 participants. The analysis using the semi-mediated cross-lag model showed that only information presentation homogeneity showed a stable and synchronized mediation effect in the effect of the number of short video followers on subjective well-being.Through this study, the researchers confirmed the bi-directional relationship between the number of short video followers on subjective well-being and the mediating effect of information presentation homogeneity in this effect, expanding the breadth of the intersection of journalism, media, and psychology, and advancing the depth of the study by applying longitudinal tracking research methodology. The research process and results provide a paradigm for the study of short video applications and a quantitative research model for the study of the usage behavior of other cell phone applications.