Hello friends. I am trying to do something with emboss function but I
can't. I want to extrude a text on this concave surface but extruded
letters must follow some circle on surface and they need to be always
normal on surface. Also, their dept need to be constant.Please, if someone want to help me to say how to do.

Hi,Try something like this http://www.cadforum.cz/catalog_en/file.asp?blk=10502 

Well, thank you very much. That's it. You propound nice way to resolve problem. What if section of body is not circular but something like on attached picture?