Purpose/Significance The existing research on the subject of readers' recommendation lacks in-depth discussion on the reasons for readers' recommendation. This paper analyzes and interprets the reader's recommendations from a new perspective in order to explore the multiple values of reader recommendation and purchase services, and build relevant theoretical models. It provides a theoretical basis for giving better play to the role of reader recommendation service. Method/Process In recent years, grounded theoretical application has attracted much attention of more and more scholars. It is also considered to be a reliable and effective data processing and analysis method in the field of library and information science (LIS), which is especially helpful to improve the effectiveness of user based qualitative research. This study uses the research method of grounded theory to analyze the "recommendation reasons" based on the reader's recommendation data. We extracted and conceptualized the main meaning of th