Before exporting, you must georeference your drawing. Google Earth uses the global system. If your AutoCAD project is in a local or national coordinate system, it must be converted.
In Google Earth Pro, right-click your imported layer > Properties (or "Get Info"). Go to the Altitude tab. Change the drop-down from "Clamped to ground" to "Relative to ground." This keeps your CAD lines flat but pressed against the terrain surface. For 3D buildings, use "Absolute" and set a base height. how to import autocad to google earth
If you are a student or hobbyist without a CAD license, . It has a learning curve, but it is powerful and free. Before exporting, you must georeference your drawing
Open QGIS. Go to Layer > Add Layer > Add Vector Layer . Source type = "File". Select your DXF file. You will see a list of entities (Point, Line, Polygon, etc.). Select all that apply. In Google Earth Pro, right-click your imported layer