HiAny one help me.I just edit block and after that save my dwg but there is only block but other things not showing in dwg. how i can view that line work in dwg.

In Model Space try Zoom Extents.  Maybe you somehow moved your model area and now you just can't see your work.Dave.

Do you as a matter of routine have AutoCAD create a BAK file when you save a drawing?

Which version of AutoCAD are you using?