help plz can i make obj in fasm???

AFAIK no.

Are you talking about COFF (Common Object File Format) in order to link obj files with those produced by C++ for example?

If yes, the answer is that fasm can produce it with format directive. MS COFF is also available.
Produced obj files can be linked with Alink, MS link, borland's tlink but I suggest you to use excellent GoLink.
Search this board for examples

Pelaillo,

Borland's tlink can't handle MS COFF object files. So, you should need an another tool coff2omf provided by Digital Mars.

MS COFF not, but COFF yes if I remember correctly. It's a long time since I used tlink for the last time.