The method of "small binding" with thread binding originated from the traditional binding technology in China, which is also called "thread binding". Thread-binding refers to folding pages into small notebooks, passing through the center of each notebook, and finally tightly tying them together to form a book. This binding method appeared as early as the Tang Dynasty, and gradually evolved into various common binding methods in modern times with the passage of time. At present, the way of ordering small books is still very popular, because it can divide a book into several small books, which is convenient for carrying and reading, and at the same time can make the reading experience of books more comfortable.