1. questionnaire survey: design a questionnaire for library users, including borrowing behavior, borrowing frequency, borrowing preference and other issues. Online questionnaire tools, such as SurveyMonkey or Google Forms, can be used to send links to questionnaires to library users and encourage them to fill in and provide real feedback.

2. Interview: Select some library users and conduct face-to-face or telephone interviews to gain a deeper understanding of their borrowing behavior and needs. More detailed information can be obtained through interviews, such as the reasons why they choose to borrow books and their satisfaction with library services.

3. Statistical data analysis: with the help of the library's lending system and management system, analyze lending records and reader behavior data. Can count the library borrowing volume, borrowing list, borrowing type and other data. Through the analysis of these data, we can understand the needs and preferences of users for different types of books.

4. Focus group discussion: Invite some readers to participate in focus group discussion to discuss and exchange the library's lending service. This way can collect readers' direct opinions and suggestions, and help the library understand users' needs and the direction of improvement.

The above methods can be combined to obtain multi-angle and all-round survey results. Through investigation and analysis, the library can better understand users' needs, improve services and provide a better lending experience.