[目的/意义]揭示隐私不确定性视角下移动APP用户隐私风险自留行为特征和影响因素，解释用户选择承担隐私风险所致损失而不积极采取隐私应对措施的悖论现象，有利于强化用户隐私安全保护和优化移动应用生态。[方法/过程]采用扎根理论方法，对移动APP用户隐私风险自留行为特征和影响路径展开探索性分析。[结果/结论]隐私不确定性视角下移动APP用户隐私风险自留行为特征包括主动隐私让渡、默认隐私许可、被迫隐私妥协，行为后果包括风险加剧、风险成瘾、认知僵化；用户层面、平台层面、收益驱动层面和社会环境层面的10个因素影响隐私风险自留行为的发生，用户隐私不确定性在这些因素对隐私风险自留行为的影响路径中发挥中介或调节作用。

[Purpose/significance] This study aims to reveal the characteristics and influencing factors of mobile APP users' privacy risk retention behavior from the perspective of privacy uncertainty, explaining the paradoxical phenome⁃non where users choose to bear losses caused by privacy risks rather than actively adopt privacy protection measures. It contributes to strengthening user privacy security protection and optimizing the mobile application ecosystem. [Meth⁃od/process] Based on grounded theory method, this study explores the characteristics and influencing pathways of mo⁃bile APP users' privacy risk retention behavior. [Result/conclusion] Under the perspective of privacy uncertainty, mo⁃bile APP users' privacy risk retention behavior manifests as three characteristics: active privacy concession, default pri⁃vacy permission, and forced privacy compromise. Such behavior leads to intensified risks, risk addiction, and cognitive rigidity. At the user level, platform level, privacy benefit level, and social environmental level, ten factors influence the occurrence of privacy risk retention behavior. User privacy uncertainty plays a mediating or moderating role in the path⁃ways through which these factors affect privacy risk retention behavior.