The method of adding negative numbers in the fields of gis attribute table is as follows:

1. Open the property sheet option, add a field, fill in the field name, determine the field type, and add a negative number to the field property.

2. Right-click the blank space above the arcgis panel, check the editor, open the editor, click Start Editing, select the property sheet to edit in the Start Editing window, and then click OK. At this point, you can manually modify the content under this classification. After all the modifications are completed, click Editor under Editor Tool to stop editing and save the editing contents, that is, add the modified fields.