The method of changing the footnote serial number in the text of word paper to superscript is as follows (taking word20 19 version of windows 10 system as an example):

1. Drag with the mouse to select the serial number before the footnote.

2. Click the Start tab button at the top of the word interface.

3. Click the X2 button in the subsequent interface (2 is above the X).

4. Then you can see that the footnote becomes superscript mode.