[目的/意义]探究青年群体社交媒体倦怠情绪的产生机理与影响，有助于了解移动互联网背景下青年群体社交媒体使用行为的变化，对建设健康可持续的社交媒体平台生态具有积极的指导意义。[方法/过程]结合“感知—情感—行为意愿”框架(Cognition—Affect—Conation Pattern, CAC)建立研究模型，借助Amos软件对353份有效问卷数据进行结构方程模型检验。[结果/结论]研究发现代际沟通不畅、消极社会比较、用户沉浸觉醒、好友互动减弱、信息推送过载均会导致青年群体社交媒体倦怠情绪，印象管理和错失焦虑与青年群体社交媒体倦怠情绪无明显关系。社交媒体倦怠情绪易使青年群体出现沉默潜水、忽略倦怠、屏蔽免扰、知识隐藏等消极使用行为。

[Purpose/significance]Exploring the generation mechanism and influence of social media fatigue among youth group is beneficial to recognize the change in their social media usage behavior under the background of the mobile Internet era, and has positive guiding significance for building healthy and sustainable social media platform ecology.[Method/process]Establishing research model based on Cognition—Affect—Conation Pattern, this study analyses the data collected from 353 valid questionnaires by using structural equation model through Amos.[Result/conclusion] It is found that poor intergenerational communication, negative social comparison, awakening from immersion, few interaction and overload information have significant impact on social media fatigue, while impression management and missing anxiety have no significant impact on it. Social media fatigue is likely to lead to the passive use, such as keeping silent, neglecting, shielding from disturbance and hiding knowledge.