Hi Every One HELPWould you please create centerline between polylines in attach dwg file , like "Collapse Dual Lines" layer's that generated by "Arcmap"http://www.freeuploadsite.com/uploads/13685187661.rar

You can't, sir.
The best effort, in Autocad, will yield something like this:

tanks for your consideration

DEAR 
NovareseOffset distances between polylines are not the same; so, we need either an autolisp routin or an map3d module.