[目的/意义]帮助他人搜索互联网健康信息是一种普遍存在的社会支持形式。探究互联网环境下在线健康信息替代搜索行为的影响因素，能为理解用户替代搜索行为提供借鉴意义和参考价值。[方法/过程]本文通过对曾经有过在线健康信息替代搜索经历的18名用户进行半结构化访谈，运用扎根理论方法对访谈资料进行编码，探索在线健康信息替代搜索行为的形成机理以及影响因素。[结果/结论]通过三个步骤的编码过程，本文得到30个初始概念、13个范畴及其对应的患者需求、搜索者心理动机、搜索者认知动机和环境因素4个主范畴，在此基础上构建出互联网环境下在线健康信息替代搜索行为的影响因素模型。

[Purpose/significance]Online health information seeking on behalf of others is a common approach of social support. Exploring the influencing factors of online surrogate health information seeking behavior will provide a theoretical contribution for understanding the behavior of surrogate seekers in the health domain. [Method/process]In this paper, a semi-structured interview was conducted with 18 users who had experience of online surrogate health information seeking. We used grounded theory to code interview data, and explored the formation mechanism and influencing factors of online surrogate health information seeking behavior. [Results/conclusion]Through the three-step coding process, we get 30 initial concepts, 13 categories and their corresponding 4 main categories, including patient needs, surrogate seekers' psychological motivation, surrogate seekers' cognitive motivation and environmental factors. Finally, we proposed a model of influencing factors of surrogate health information seeking behavior in the Internet environment.