[目的/意义]探讨信息检索情境下任务情感极性对检索行为的影响，为提升检索系统情感回应提供参考。[方法/过程]通过实验研究，随机招募36名被试，完成指定的积极、消极两类共6个信息检索任务，利用Morae软件记录得到216次检索过程，分析不同任务情感极性、信息检索过程情绪下的检索行为差异，以及两类情绪对检索行为的交互影响。[结果/结论]信息检索任务的客观极性和主观极性总体上具有一致性；积极检索任务下用户呈现更多的查询交互，消极检索任务下用户呈现更深入的浏览查看。检索努力越高，检索过程情绪越消极。检索体验受检索过程情绪影响显著。信息检索任务情感极性与检索过程情绪在查询、鼠标、查看相关的9个指标上呈现显著交互效应，表明不同任务情感极性促进和抑制检索行为的程度受检索过程情绪调节。

[Purpose/significance] It explored the impact of task sentiment polarity on retrieval behavior in the context of information retrieval, providing reference for improving the sentiment response of information retrieval systems.[Method/process] Thirty-six subjects were randomly recruited to finish assigned three positive and negative retrieval task separately. Morae software was applied to record 216 retrieval processes. It analyses the differences in retrieval be⁃haviours under positive and negative information retrieval tasks, information retrieval process emotions, as well as the interactive effects of both emotions on retrieval behaviours. [Result/conclusion] The objective polarity of the informa⁃tion retrieval task and the subjective polarity are generally consistent; users conducted more query interactions under the positive tasks, and more in-depth browsing and viewing under the negative ones. The higher the retrieval effort, the more negative the emotions during the retrieval process.The user experience was significantly affected by the retrieval process emotion. Information retrieval task affective polarity showed significant interaction effects with retrieval process emotion on nine indicators related to query, mouse, viewing, and time, suggesting that the degree to which the sentiment polarity of different tasks promotes and inhibits retrieval behavior is regulated by the emotion of the retrieval process.