1. shortage of funds: the main sources of funds for libraries are government grants, social donations and their own income. However, in recent years, the reduction of government funding and social donations has led to a shortage of funds for libraries, making it difficult to maintain normal operation and update book resources.

2. Restrict invalid borrowing: Free borrowing can easily lead to book loss and invalid borrowing, which will affect the borrowing needs of other readers and waste the manpower and material resources of the library. The introduction of charging mechanism can restrain this phenomenon and make the borrowing behavior more standardized and effective.

3. Improve the service quality: charging a certain rental fee can improve the service quality of the library, such as increasing the opening hours or opening a special children's reading area to further meet the needs of readers and enhance the user experience.