Among between the binary compound of transition metals and V group elements of periodic table , M with 585K curie temperature is only ferromagnetic compound of Sb compounds with first row transition metals. In this thesis , first we study bulk properties of M in NiAs structure and we found out density of state and band structure of this system. M in NiAs structure found ferromagnetic metal . after we study M in zincblende structure that result of these calculations is halfmetalic behaviour. After we study interface of M with GaSb therefore we can study thin films of them in interface . results of these caculations show that M in interface with GaSb preserve halfmetalic behaviour.