The "Preface" and "Postscript" of "Good Words and Good Sentences" usually appeared in novels, essays, poems, and other literary works. It was the author's introduction and reflection on his own works, and it was also an important part of the works. The preface usually included the background of the work, the author's personal experience, and the intention of the work to help the readers better understand the background and theme of the work. At the same time, the foreword could also provide readers with the author's evaluation and outlook on his work, showing the author's love for the work and recognition of his own creation. The postscript usually recorded the plot, character creation, and detailed description of the work. It was an important part of the author's detailed interpretation and reflection of the work. The postscript could also provide the reader with the author's understanding and perception of the work, as well as the position and influence of the work in the history of literature. The "Preface" and "Postscript" of "Good Words and Good Sentences" are important parts of the work. They can help the readers better understand the background and theme of the work, provide the author with his own evaluation and prospects, and also provide the readers with understanding and perception of the work.