Modern versions of AutoCAD have a built-in "Geolocation" feature that pulls data directly from Bing Maps (similar to Google Earth). Type GEOGRAPHICLOCATION in the command line.
If you simply need a background image for a site plan, this is the most straightforward method. google earth pro to autocad
If you only have standard AutoCAD, you need an intermediate tool. There are free scripts and plugins (often found on forums like CADTutor or Github) that convert Google Earth terrain to DXF. Modern versions of AutoCAD have a built-in "Geolocation"
If you are using , you can import Surface data via .DEM files or use the "Autodesk Connector for ArcGIS" to pull in topographical data that matches the quality of Google Earth. Pro-Tips for a Perfect Export google earth pro to autocad