儿童青少年肥胖的全球大规模流行，正严重威胁着人类健康。近年来，多篇国际权威学术期刊报道了肥胖流行存在传染现象，但目前研究对肥胖传染的发生机制尚无明确结论。本研究基于前期工作基础，以儿童青少年的同伴社会网络为切入点，探讨肥胖如何在儿童青少年群体中进行行为传播。研究首先以复杂自适应系统视角融合信息传播过程与健康行为心理过程，提出儿童青少年肥胖行为传染假设框架；其次，通过追踪调查收集数据，验证儿童青少年肥胖的行为传染现象，揭示传染与致肥胖环境的协同效应；再次，基于假设框架与调查数据模拟肥胖行为传播过程，创新性地解析肥胖通过7类传播行为、3类传播因子、2类传播因素在儿童青少年群体中发生传染的可能机制；最后，基于传染机制解析结果进行情景仿真，检验健康行为榜样策略、健康危险行为阻断策略、健康信使策略对儿童青少年肥胖的防控效果，为运用社会网络级联特征开展人群健康管理，筛选干预措施，提供实验室证据参考。

As a public health crisis, childhood and adolescent obesity is affecting human health world-widely. In recent years, several influential papers indicated that "obesity is contagious". However, there is no consensus regarding how the contagion happens. Based on previous work, the present study explored obesity contagion among children and adolescents' social network. Firstly, complex adaptive system is used to combine the dissemination mechanism and psychology mechanism to construct our research hypothesis. Then, longitudinal survey will be conducted to test obesity contagion among adolescents, as well as its interaction with obesity environment. Based on the longitudinal data, mechanism hypothesis will be simulated, including seven obesity behaviors, three disseminative components and two influential factors. At last, simulation experiments will be conducted to test three social network strategies to provide evidence-based approach for obesity intervention programs.