It is divided into six steps:
1. First, edit the composition in the word document.
2. Then on the Insert menu, click the Picture button.
3. Then select the target picture in the computer folder and insert it.
4. Then select the picture and set its text wrapping mode to "Below Text".
5. Then set the picture size to the page size of the word document. In short, the picture should cover the whole page.
6. Finally, print a preview to preview the effect.