The method comprises the following steps:
1. Open the WORD document to be operated, select the whole document text through Ctrl+A, and click the Expand button in the lower right corner of the font in the Start tab.
2. Select and set the corresponding fonts in the option boxes under "Chinese fonts" and "Western fonts" respectively, and then click "OK".
3. Back to the main document, I found that in WORD, all English and punctuation marks are set to one font, and all Chinese characters are set to another font.