1. First, you need to open ArcCatalog and create a personal geodatabase.

2. Then right-click the personal database to create a feature data set and create a new? In the Feature Dataset window, name the feature class (such as terrain) and click Next.

3. Next, select the coordinate system. Here, you can directly import the coordinate system of the spatial data that needs to establish topology, click Import to find the spatial data, and then click Finish.

4. Then right-click the newly created feature dataset topology, find the spatial data to establish the topology, add the data and click OK.

5. Then you can see that the data has been added.