[目的/意义] 通过为用户提供网络互动和社交支持，在线健康社区能够促进健康行为的传播与影响，提升用户的行动能力和认知水平。旨在通过评估在线健康社区中个体的参与行为，为社区的建设和规划提出相应建议。[方法/过程] 利用百度戒烟吧的用户数据，通过统计分析与社会网络分析方法，分析用户的活动状态、好友网络以及参与需求。[结果/结论] 百度戒烟吧正在逐渐丧失对用户的粘性，虽然活跃用户已经形成了稳定的群体，但用户整体处于高度离散和分裂的状态。同时，短期用户的参与动机主要是寻求社会支持和自我满足，长期用户则扮演着欢迎者的角色，是推动用户参与的主要作用力，是利他主义的执行者。
[Purpose/significance] The online health community promotes the spread and impact of health behaviors and improves the user's ability to act and perceive, by providing users with network interaction and social support. The purpose of this study is to evaluate the engagement behavior of individuals in online mutual assistance community.[Method/process] Dataset is from Baidu Quitting Smoking Post Bar.Using statistical analysis and social network analysis, this article studies the users' activity status, friendship networks and engagement needs. [Result/conclusion] Baidu Quitting Smoking Post Bar is gradually losing the viscosity of the users.Although the active users have formed a stable group, the user community is in a highly discrete and split state. At the same time, the motivation of short-term users is mainly to seek social support and self-satisfaction.Acting as a welcome role, long-term user group is the main force to promote user engagement and the executor of altruism.
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