We prepared La(Ni-M)O-3 (M Al, Cr, Mn, Fe, Co, Ga) samples and investigated their characteristics as solid oxide fuel cell (SOFC) cathode materials. We found that the LaNi1-xFeXO3 satisfies the important requirements for a cathode, if x in this system is around 0.4. This system has its highest electronic conductivity of 580 S/cm at 800 degrees C, when x in LaNi1-xFexO3 is 0.4. This value is more than three times higher than that of La0.8Sr0.2MnO3 (180 S/cm). The average thermal expansion coefficient of LaNi0.6Fe0.4O3 from 30 to 1000 degrees C is relatively low (11.4 x 10(-6) K-1) and closer to the 0.92 ZrO2-0.08 Y2O3 (YSZ) value (10.0 x 10(-6) K-1) than La0.8Sr0.2MnO3 (12.0 x 10(-6) K-1).