Standards that packaging must meet when leaving the factory. Specifically, hardcover books are packed with kraft paper of more than 80g, and paperback books are packed with kraft paper of more than 70g. The height of each package is 16100-120mm; 32 format (large, medium and small) 200-220mm；; 40, 48 double package,100-120 mm; 60, 64 split double package, 200-220mm；; Special formats are handled as appropriate. Books should be packed in whole numbers as far as possible within the specified size. For this reason, when integer packaging is needed, the height of 32-format is allowed not to exceed 230 mm A complete set of books, a set of fixed-price packaging; Individually priced individual packaging. Hardcover books with plastic covers and paperbacks with plastic films, as well as books with high cover ink concentration, must be padded with white paper of the same width between this book and this book to prevent adhesion.