The Ni/Mg/Al catalyst doped with rareearthmetals were prepared by cold plasma decomposition and reduction of hydrotalcite-like compound, and the effects of La and Ce on pyhsico-chemical properties and catalytic performance of dry reforming were studied. The catalysts were characterized by X-ray diffraction (XRD), BET surface area and porosity analysis (BET), X-ray photoelectron spectroscopy and thermogravimetry (TG). The results suggested that hydrotalcite-like precursors were completely decomposed to mesoporous Mg(Ni,Al)O solidsolution which partly reduced to Ni0 by cold plasma jet. The conversion of CO2 and CH4 were 76% and 61.8% at 700 ℃ with V(CH4)/V(CO2)=4/6,GHSV of 30000mL/(h·gcat). The promoter of Ce improved catalyst lattice oxygen concentration and promoted the elimination of carbon species on the catalyst surface,, and the conversion of methane and carbon dioxide were increased by 5% and 7%, respectively. While the promoter of La inhibited the agglomeration of Ni0 and improved the dispersion of Ni0, and the non-active carbon deposition decreased by 70%, showing better anti-coke property.