Under conditionof the dual-carbon target background, the development of new energy materials and technologies is one of the main issues. Fe-based perovskite cathode materials are potential hot materials for cathode materials of solid fuel cells at medium and low temperatures. Taking La0.5Ba0.5FeO3 as matrix materials, Ca ion is doped by replacing some Ba atoms to make the ratio of Ba and Ca double ions adjusted, and a series of cathode materials La05Ba05-xCaxFeO3 (x=0.1, 0.25, 0.4, 0.5) are synthesized by a solid state reaction method. And the phase structure, thermal expansion behavior,conductivity, electrocatalytic activity and battery electrode performance are systematically studied. The overall structure of the sample is of cubic perovskite. La0.5Ba0.5-xCaxFeO3is characterized by a good thermal compatibility with the thermal expansion coefficient of electrolyte. The maximum conductivity of La0.5Ba0.1Ca0.4FeO3 is 187.7 S/cm. The Ca doping is to greatly improve the output power density of cell with La0.5Ba0.5-xCaxFeO3as electrode to make the output power density stable relatively, and the peak power density reaches 595 mW/cm2 at 800 ℃. The doping of Ca ion can promote the performance of La0.5Ba0.5-xCaxFeO3 cathode material, and such doping material is a good candidate material for intermediate temperature solid oxide fuel cell(IT-SoFc)cathode.