[目的/意义]学术期刊编委团队通常由一些具有较高学术成就的学者组合而成，不仅对学术期刊的发文内 容以及发文质量进行把关，而且对学术期刊的办刊宗旨、政策方针、发展方向有较大的话语权。本文旨在揭示学 术期刊编委团队的变化给所在期刊发文特征带来的影响。[方法/过程]研究以图书情报领域的国际一流期刊Jour? nal of the Association for Information Science and Technology（JASIST）和 Information Processing & Management （IP&M）为例，从期刊主题演化和影响因子变化的角度进行分析。本文以主编更换时间点作为窗口划分节点，利 用LDA模型从主编和编委调整前后的文章标题和摘要信息中提取主题，引入信息学模型对主题多样性进行论 证，分析两本学术期刊编委团队变化对期刊主题演化的影响。此外，获取期刊近5年的影响因子，并对比编委团 队更换前后的变化趋势。[结果/结论]研究结论揭示了国际学术期刊编委团队变化对于期刊的发展产生的显著作 用，也对图书情报领域国际权威期刊近年来在选题和方向上的坚守与突破进行了回顾。

[Purpose/significance] The editorial board of academic journals is usually composed of scholars with high reputation and achievements, who not only gatekeep the publication content and publication quality, but also have great control on the purpose, policy and development direction of academic journals.This paper aims to reveal the influence of changes in the editorial board of academic journals on their publication characteristics.[Method/process] This pa? perselected two top international journals (i.e., Journal of the Association for Information Science and Technology and In? formation Processing & Management) in the library and information science (LIS) field as cases and focused on the per? spective of changes in topic evolution and impact factor.On the one hand, the study employed the LDA model to extract topics from the titles and abstracts of journal articles before and after the adjustment of the editorial board. In addition, the information model was adopted as a framework to help illustrate the diversity of topics and analyze the impact of changes in the editorial board of two academic journals on the topic evolution. On the other hand,the study targeted on the impact factors of journals in the last five years and compared the changing trend before and after the adjustment of the editorial board. [Result/conclusion] The research findings confirm that there is a significant synchronous effect be? tween the adjustment of the editorial board and the development of international academic journals. Besides, the paper also presents the current status and breakthrough in the topic selection and direction of the top international journals in the LIS field in recent years.