Abstract: 【Purpose/significance】Analyze the reading needs of the infant group, build a user portrait model, and provide support for

publishers and libraries to provide high-quality products and accurate services for the low-child user group.

【Method/process】Based on the online comments of users who bought children's picture books on Taobao, construct a conceptual model of user portraits based on low child information attributes, children's picture book information attributes, and buyer (parent) comment information attributes,and built using Protégé and OWL The ontology is visualized in the OntoGraf plug-in, which analyzes and presents the characteristics of the user portraits of the low-child reading group.【Result/conclusion】According to the three types of children's picture books, con⁃struct a group portrait of low children reading.【Innovation/limitation】This article explores the potential needs of users based on on⁃line comment data for purchasing children's picture books by proxy users. The downside is that for low-child users, only relying on the information provided by parents to mine reading needs may have problems such as incompleteness. For specific research, it is neces⁃sary to conduct a more in-depth study of the research subject in combination with experiments and other methods to improve the re⁃search conclusions.