1. Identification and identification: Barcode is the unique identification of books, which can help librarians identify each book for borrowing, returning and fine.

2. Data collection: When books are lent out, the librarian can scan the bar code with a machine similar to a supermarket cashier and upload the borrowing information of books to the library network, which is convenient for data collection and management.

3. Information tracking: Through the barcode, the borrowing history of each book can be tracked, including borrowing time, return time, borrower information, etc. , which can help librarians manage books better and provide better services for readers.

4. Improve efficiency: The use of barcode greatly improves the efficiency of book management, reduces the error rate, and makes the borrowing and returning operation of books more standardized and efficient.

The above information is for reference only. Please consult the librarian if necessary.