Because the preface is the beginning of an article or a book, there is no need to sign or sign. It usually includes the author's thanks, speech, introduction, etc., but it will not involve the content of the text. In academic papers, the preface usually expounds the background and significance of the research, but it does not need to be signed.

If there are special thanks or thanks to be expressed in the preface, you can list a part separately before the text, and mark the author's name, time and other information. Preface, also known as preface, preface, clue and quotation, is written in front of books or articles. The preface mainly explains the basic content, writing intention, academic value and writing process of this book.