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Biomedical magnesium alloys have become an ideal material for degradable implants because of their similar density and elastic modulus with human bone. In this study, Mg-3Zn-0.2Ca-xAg (x = 0%, 0.1%, 0.3%, 0.5%, 0.7%, wt.%) alloys were fabricated to enhance the comprehensive properties of the Mg-3Zn-0.2Ca (wt.%) alloys. The microstructure shows that the alloy possesses relatively smaller grain size of 2.08 μm when the addition of Ag is 0.3 wt.%. The Mg-3Zn-0.2Ca-0.3Ag also owns the best mechanical properties whose elongation, yield strength and tensile strength are 4.57%, 5.7%, and 2.4%, respectively, higher than that of Mg-3Zn-0.2Ca. The electrochemical experiments shows that Mg-3Zn-0.2Ca-0.3Ag has lower corrosion current density (30.5 μA/cm2), which indicates that its corrosion resistance has been improved. After immersed in simulated body fluids at 37 ℃ for 15 days, the hydrogen release rate and degradation rate of the Mg-3Zn-0.2Ca-0.3Ag is significantly lower than that of Mg-3Zn-0.2Ca. In addition, the cytotoxicity test with L 929 cells shows that Mg-3Zn-0.2Ca-0.3Ag alloy has good biocompatibility.