Effects of added ways,such as direct addition and master alloy addition,on absorptivity of MM in die casting magnesium alloy were investigated.The results indicate that mistchmetal absorptivity is less than 50% by directly adding mistchmetal with melting at 720℃ in well type crucible furnace for less than 30 min.Mg matrix mischmetal can be prepared by casting combining with squeezing casting method,which exhibits Mg-RE metallic compound with various types and fine grain sizes from OM（optical microscope）analysis,and melting point is higher than die casting temperature from DSC observation,leading to fast solution velocity.The mistchmetal absorptivity can reach 94% and 96%,respectively,with adding mischmetal in as-cast ways and in extruded ways at 720℃ within 10 min in well type crucible furnace.Mischmetal absorptivity can reach up to 80% in die casting AZ91D magnesium in conventional cold chamber die casting machine with adding extruded master alloy,showing acceptable alloying process for RE element.