Preparation of porous Ni bulk catalyst by spark plasma sintering (SPS) with spherical atomized Ni powder as the starting material was studied. The microstructure and phases of the prepared porous Ni bulks were characterized by SEM, the nitrogen adsorption test and XRD. In addition, the catalysis properties of the porous Ni bulk in the Partial Oxidation of Methane (POM) process with high flow rates were investigated. The results show that the clean porous Ni bulk catalyst with porosity larger than 70% can be prepared by the SPS process. The catalyst prepared at 850 oC and held for 120 s can be applied in the POM process with a flow rate up to 2.70 L/min. The conversion ratio of CH4 in the catalyzed POM process with the catalyst is higher than 80%.