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Three as-cast and as-extruded Mg-5Zn-xY-0.6Zr (x=5 wt％,8 wt％,11 wt％) alloys were prepared,and the effects of Y content on the microstructures and mechanical properties of the alloys were investigated.The results show that the investigated Mg-Zn-Y-Zr alloys mainly consist of a-Mg,X-Mg12YZn and minor amount of W-Mg3Y2Zn3 phases.The volume fraction of X-Mg12YZn phase increases and that of W-Mg3Y2Zn3 phase decreases with the rising of Y content in the alloys.The as-extruded Mg-5Zn-11Y-0.6Zr alloy owns the optimal ultimate tensile strength and yield strength of 429 and 351 MPa,respectively.Mg-5Zn-5Y-0.6Zr alloy owns the maximum elongation of 13.6％.