查询扩展用以解决用户查询意图与查询结果之间的语义偏差问题,从而更有效地帮助用户更快捷、更精准地从海量网络资源中找到所需信息。论文运用实验法,辅之问卷调查,揭示了用户在学术平台搜索过程中运用的的查询扩展类型、频率和查询扩展的效果。研究还发现,学术平台用户对搜索主题的熟悉程度和搜索任务的难易程度对查询扩展行为产生不同的影响。 The query expansion can solve the problem of semantic deviation between the user’s query intention and the query result, so as to help users find the required information from the massive network resources more efficiently and accurately. The thesis uses the experimental method and the questionnaire survey to reveal the effect of users’ expansion type, frequency and query expansion in academic platform search. The study also found that academic platform users’ familiarity with search topics and the difficulty of search tasks have different effects on query expansion behavior.