In this study, the effect of sintering parameters such as sintering temperature, pressure, and degassing treatment on the microstructural evolution, properties and corrosion resistance of a Mg-6%Al alloy consolidated by spark plasma sintering (SPS) was investigated. Experimental results revealed that degassing treatment prior to sintering was a critical step in the spark plasma sintering process. We concluded that the impurity concentration on the surface of the sintered material was remarkably reduced by degassing treatment and consequently bonding strength among particles was enhanced. Tensile strength of the sintered magnesium alloy would depend on the nature of PB. Much strong bonding between particles would be achieved from the combination of high sintering pressure and temperature, where breakdown of oxide film along the powder boundaries would become easier and then fraction of metal-to-metal bonding interface would be increased. A magnesium alloy of high ductility, strength and corrosion resistance was obtained when a sintering temperature and pressure of 0.82 Tm and 130 MPa, respectively, was employed combined with degassing treatment.