When readers borrow books in various lending rooms, they must use them correctly instead of bookboards. (l) Take my library card at the door and exchange it for books (big board and small board). (2) When selecting books on the bookshelf, insert the substitute board (longboard) into the book position in time after taking down a book. If you don't need a book, you should put it back on the substitute board, and then remove the substitute board and choose a book. (3) When you choose a good book and decide to borrow it, you should return the borrowing substitute board (long board and short board) to the entrance at the same time, get back the borrowing list, and then go through the borrowing formalities. (4) If readers don't borrow books, but just read books, then when you choose books, you can insert the substitute board (longboard) in the position of the book you choose without taking it out. After reading it, you can retrieve the big board according to the number on the small board, and then put the big board and the small board back at the entrance at the same time, and you can get your own library card.