Solid oxide fuel cell (SOFC) is a clean and efficient energy conversion device, whose efficiency is dependent on the oxygen reduction reaction at the cathode. The development of high performance cathode materials is the key to increase the efficiency of SOFC. Among Fe-based perovskite cathode materials, BaFeO_3-δ has excellent oxygen transport property. Because the phase transition occurs at the working temperature, it has negative effect on thermal compatibility, conductivity and electro-catalysis performance of BaFeO_3-δ. Owing to the perovskite structure, BaFeO_3-δ could be stabilized through element doping. Element doping at A-site and B-site of BaFeO_3-δ is summarized. The effects of element doping on tolerance factor, crystal structure, conductivity, oxygen non-stoichiometric ratio, coefficient of thermal expansion and electrochemical performance of BaFeO_3-δ are discussed.