[目的/意义]微信群信息交流过程存在多元化角色类型，识别微信群潜水者角色类型及分析潜水行为动因，对深入探究微信群信息交流过程及把握其内在交流机制等具有重要意义。[方法/过程]以微信群中的真实交流样本作为研究对象，计算成员直接参与度与间接依赖度，并设计成员离群率算法识别微信群中的潜水者群体；基于时间序列发言数划分潜水者角色类型，通过定义成员交互强度与兴趣契合度计算成员之间的亲密度，并作为边权重构建信息交流网络，结合网络结构动态演化特征分析微信群成员潜水行为动因。[结果/结论]通过计算成员离群率及时间序列发言数能够有效识别微信群中的潜水者及其角色类型，基于对成员网络嵌入位置、角色作用等演化分析发现成员潜水行为主要与成员身份地位、话题兴趣度及关系亲疏度相关。
[Purpose/significance] The information exchange process in WeChat group has diversified role types, and it is of great significance to define the role types of WeChat lurkers and to analyze the causes of diving behavior to further explore the process of information exchange and grasp the inner communication mechanism of WeChat.[Method/process] Based on real dialogue sample as study object, the paper calculated the members' direct participation and indirect dependence, and designed the algorithm of the rate of outlier to quantitatively identify the lurkers in the WeChat group. The lurkers' character types were divided based on time series statements, calculate the intimacy between members through interaction intensity and the fit of interest, and build the information exchange network as the weight of the side, and the behavioral motivation of lurkers was analyzed in WeChat group based on dynamic evolution of network structure.[Result/conclusion] By calculating the rate of outlier and the number of time series statements, it can effectively define the lurkers and their role types in WeChat group. Based on the evolution analysis of member network embedding position, roles and so on, it is found that there is a correlation between lurkers' behaviors and membership status, topic interest, relationship between members and so on.
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