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The high cost and low stability of Pt-based oxygen reduction reaction (ORR) catalysts have limited their commercial applications. In this paper, we report the microwave synthesis of ultralow loading Ru-Mo2C on carbon nanotubes (CNT) as ORR catalysts to alleviate these above disadvantages. Ru-Mo2C@CNT exhibited excellent oxygen reduction reaction activity with a half-potential of 0.87 V and an onset potential of 0.94 V. It has high stability and palmary anti-methanol capability in alkaline electrolytes. This Ru-Mo2C@CNT may be a promising alternative to Pt-based electrocatalysts in energy conversion and storage.