Abstract: A porous catalyst includes at least one noble nano-metal particle, an oxide for forming porous structures, and a carrier material for supporting the oxide and the at least one noble nano-metal particle. The porous catalyst shows a large electrochemical surface area and a highly conductive ability. Further, the noble nano-metal particles are separated on the oxides uniformly, and the oxide of the catalyst forms a porous structure to provide a large electrochemical surface area. The porous catalyst provides excellent proton/electron transfer ability and increases the reaction rate.