Abstract: The porous magnesium bulk as bone substitute implant was prepared by spark plasma sintering (SPS) using the sublimate material (naphthalene) as pore-forming agent. The results show that, the porous magnesium bulk in the controllable structure and size with higher porosity (44.25%) and non-obvious powder particle growth can be manufactured by spark plasma sintering at 470 ℃. The sublimation pore-forming agent can effectively adjust pore volume, realize the reasonable collocation between macropores and micropores, and improve pore connectivity in porous magnesium bulk. The secondary pollution problem resulted from the traditional method can be solved by the combination of sublimation pore-forming agent and spark plasma sintering technology, which is technical advantageous to prepare the porous metal material in high demand of porosity and particle connectivity.