Characteristics of reduction properties and carbon deposition of CuFe2O4 and Fe3O4 were investigated by using TGA, XRD, SEM, TEM and gas analysis at 900 ℃. XRD analyses indicated that the reduced Fe3O4 was composed of Fe, graphite and Fe3C phases. In contrast, the reduced CuFe2O4 did not show the graphite or Fe3C phases. It was observed by SEM analysis that the surface of the Fe3O4 was completely covered with carbon, after methane partial oxidation. From gas analysis, CuFe2O4 showed much higher methane conversion and reduction kinetics as compared to the Fe3O4 under the same reaction conditions and the estimated carbon deposition amounts on the reduced CuFe2O4 was much lower than those on the reduced Fe3O4 during the syngas production process. It was found by TEM that carbon on the reduced Fe3O4 particles has a platelet shape.