The effect of elevated temperature deformation, artificial aging, prestrain prior to aging, and crystal orientation on the strength and ductility of extruded AZ31 alloy has been investigated. The room temperature strength of AZ31 increased in proportion to the amount of elevated temperature deformation while the ductility drastically decreased even though the deformation is carried out at 400degreesC. The ductility initially decreased with the amount of the hot deformation, and then saturated after 40%RA. The reason for the saturation in elongation is due to the formation of fine grains by dynamic recrystallization occurred during hot swaging process. Prestrain did not increase the hardness of AZ31 during aging at 150degreesC. AZ31 alloy aged without prestrain after solution treatment showed peak hardness after 6 hours. However, the hardness of AZ31 with prestrain prior to aging by 18.4%RA did not show remarkable increase and gradually decreased with aging time. The elevated temperature strength of AZ31 was significantly influenced by the orientation of the specimen. UTS and YS were highest at longitudinal direction (0degrees) and lowest at 45degrees to extrusion axis at all temperatures. The ductility of AZ31 was highest at 45degrees-orientation at all temperatures, which is considered due to the redistribution of basal planes occurring during extrusion process.