Aiming at Mg Gd magnesium alloy with higher Gd amount may lead to the increase of cost and specific gravity，Mg 6Gd 3Y 0.4Zr x Zn alloys are prepared by solvent protection，Zn content is 1%、1.5%、2% respectively. The microstructures and mechanical properties of alloys are studied by optical microscope (OM)and scanning electron microscope (SEM)，after solid solution treatment，hot extrusion and 200 ℃ aging treatment. The results show that after 200 ℃ aging treatment，the second phases in alloys have better refinement and distribution uniformity than those in solid solution state alloys，the tensile strength and yield strength of Mg 6Gd 3Y 0.4Zr 2Zn magnesium alloy is 403MPa and 336MPa，the elongation is 7.0%，the mechanical properties reached or approached those of Mg Gd Y magnesium alloy with higher Gd amount.