A method for recycling AZ91D magnesium alloy chips prepared by solid-state recycling was studied.The experiments were carried out adopting the cold-press pressure of 300-310MPa, cold-pressed time of 3-5s, and hot extrusion at 300℃, 350℃, 400℃, 450℃, respectively, with an extrusion ratio of 25∶1.The results indicate that recycled specimens of AZ91D magnesium alloy present better mechanical properties and consist of fine grains due to dynamic recrystallization.The mechanisms of dynamic recrystallization depend on plastic deformation process and change with the deformation temperature At 300-350℃, the deformation mechanisms are associated with the operation of basal slip and twinning, and the "necklace" structures were formed.At 350-400℃, the cross slip results in the formation of new grains and grain refinement.At above 400℃, the dynamic recrystallization mechanisms are controlled by dislocation climb, and recrystallized grains are homogeneous.The tensile strength of recycled specimens increases with the strain rate increasing.When the strain rate is overhigh, the cracks and fractures in the surface appear and affect the tensile strength of recycled specimens.