The relationship between theme and theme is dialectical Theme determines and dominates the theme, but the theme has to be expressed through the theme. There is no theme and commander-in-chief, the theme is just some scattered materials, which can't explain the problem and organize an article; Without the theme, the theme can't exist alone, so it can't be expressed, or it becomes an empty sermon. The refinement of themes is closely related to the selection and tailoring of themes. The process of choosing a theme around the theme is also a process of refining and deepening the theme. Whether the theme is chosen well will directly affect whether the theme of the article can be fully expressed. So the choice of theme is very important.