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The support materials of ruthenium-based catalysts for ammonia synthesis were prepared using mixed solutions composed of magnesium nitrate, aluminum nitrate and calcium nitrate with a certain ratio. The catalysts supported on complex oxides were more active and the optimal activity temperatures were lower than that supported on single oxide under the same conditions.The catalyst with Mg-Al complex oxide as support prepared by calcinafing hydrotalcite-like compound had significantlyhigher activity, 38.42 mL NH3·h-1·g-1 at 673 K. The BET determination showed that the Mg-Al complex oxide possessed large surface area, 140.95 m2·g-1, similar to γ-Al2O3.