Folding is the working process of folding printed sheets into book stickers with the size of book layout in page number order, or folding large-format printed sheets into certain specifications and formats as required. Folding is the process of folding printed large format paper into a booklet by machine or hand according to the page number sequence marked on it and the specified format size, which is the main work of the booklet. Poster insert mainly refers to monochrome pages printed in four colors, which is generally a paper publicity material to expand its influence. It is a media-based paper mobile advertisement. There are 20%, 30%, 40%, 50%, 60% and so on. Under special circumstances, manual folding can be added in the process where the machine cannot be folded. The total number of pages is not much, so it can be made into a hinge when it is inconvenient to bind; In order to improve the beautification effect of the design, or to facilitate the content classification, you can also do small folding, such as 16K triple folding; In order to meet the requirements of environmental protection, many simple instructions are now in the form of folding and not riding, such as the instructions of Epson printer and Sony digital camera. Common paper 128-2 10g/m2 coated paper, too thick paper is not suitable for folding, in order to improve the product grade, double-sided film covering can be used; The front page paper can be designed into a special shape or a variety of "beer holes". From this point of view, it is difficult to achieve comprehensive and meticulous effects and targeted publicity when such advertisements with various contents are published in other media. Leaflets are a complete form of publicity. In order to expand the popularity of enterprises and commodities, publicize products and enhance buyers' understanding of commodities, and strengthen the effectiveness of advertisements, they are mailed, distributed and presented to relevant enterprises and personnel, trade fairs and conferences, and consumers who buy commodities.