1. First, find the filling position of the lending reason on the lending form, usually in a column of the form or a place with comments.

2. Secondly, the reasons for borrowing books should be clear, specifically describe the reasons for borrowing books, and choose the appropriate reasons according to the actual situation, such as academic research, academic exchange, preparation of teaching materials for classroom teaching or training activities, personal interests, book restoration, data collation, etc.

3. Finally, when filling in the reasons for borrowing, ensure accuracy and completeness, and avoid using vague or unclear expressions, so that others can understand and verify the rationality of borrowing.