Hello,
I want to import .dwg file using three.js. any suggestion on it.
You’ll have to convert the .DWG files to a format three.js can load. I recommend .fbx, .dae or .obj
If you do a google search you should find lots of info on how to do this.
You need to import your DWG model to the modelling suite which supports exporting to glTF such as 3ds Max.