Book circulation and circulation rate are important indicators to measure the level of library work.

The circulation of books is the number of books lent.

The circulation rate of books is the ratio of the number of books lent to the number of open-shelf books in circulation.

The book circulation is an absolute index, which reflects the actual situation of the total amount of book services, the level and degree of book utilization and the professional level of library work. There are many factors that affect the circulation of books, including the quality of books, the management style and service quality of librarians, the publicity of libraries, the status of readers and so on.