Little friends who don't know how to check and modify arcgis topology errors. First, open the created topological dataset in ArcMap, and then open the Topology toolbar and the SearchNow button in the toolbar to check the topological errors. Details are as follows.

Arcgis Topology Error Checking and Modifying Steps

1. First, open the created topological dataset into ArcMap, and the red dot is the location of the topological error.

2. Then open the toolbar above to find "Customize", click "Toolbar" and enter "Topology" to open the topology toolbar.

3. Then open a new window, confirm that the feature data set of the topology is "topology", and click "OK".

4. Finally, click the Topology Error button in the toolbar to open the ErrorInspector window, and then click the SearchNow button to check the topology.

5. Then select the range and click "Search Now" to view the errors.

6. Then select the error, and right-click the "Merge" function to select a larger polygon feature in the pop-up interface.

7. Then you can see that the surface layer of the red area has been removed, and finally you can export the modified topology data.