This paper aimed to explore the impact of webpage classified information design on users’ cognition under a search task, and to provide ergonomic suggestions and design guidance for classified information optimization design. Based on two design features of classification information, namely, the overall visual complexity and the presence or absence of icons used to display category information, four experimental materials were designed. Eye-tracking instrument was used to study on user cognitive effects under one target search task. The results show that complexity has a significant impact on user cognition. Icon difference only has a significant impact on the perceived ease of use.Therefore, both the use of concise design and supplemented by visual icon to display the category information, can improve the level of classification information design.