1. At the activity site, each participant needs to put his/her book in the designated area, and put a card next to the book, on which the type and quantity of books he/she needs are written.

2. After the activity begins, participants can freely choose the books placed by others and put their own books and cards in the corresponding positions for others to see.

3. If other participants are willing to exchange, they can directly bring their own books and cards to the people who need them, and bring each other's books and cards back to their own places.