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The phase structure of La2O3-NiO system at various calcination temperatures havebeen studied by XRD and DTA-TG techniques. It is found that at 450-600℃ there aremixed phases of La2O3 and NiO and at 800~900℃ only a single phase of perovskite LaNiO3.The conductivity of the system increases with the increase in calcination temperature. Attemperature 600~800℃ a sudden change of the conductivity occurred in correspondencewith the phase transformation of the system. The catalytic activities of the system calcinatedat 600℃ and 800℃ also show a distinct “activity gap” for CO methanation and xylene combustion.