The book waist seal, also known as the book waist, is defined as "placing another text introduction similar to a tape in the middle of the book to cooperate with marketing or book recommendation".

Haruki Inoue, the author of "This Book Will Sell One Million" and a famous Japanese bestseller promoter, listed "how to make an appetizing waist" as one of the marketing elements of the book. It can be seen that the waist seal originally existed for the promotion and marketing of books. Now is an era of waist-binding, and there are almost no books that try to become popular in the market without waist-binding. However, some designs are exquisite, in line with the overall style of the book, and the propaganda language is in place; Some of them are poorly designed, such as the advertisement of the old Chinese doctor on the telephone pole, which makes people feel very disgusted.

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