The effects of Zr, O, and Zr&O plasma ion implantation on the corrosion behavior of ZK60 Mg alloy are investigated in simulated body fluids (SBF). Immersion tests reveal little surface damage after Zr and Zr&O implantation initially and after 30h immersion, corrosion protective products including Mg(OH) 2 , Ca 10 (PO 4 ) 6 (OH) 2 , Ca 3 (PO 4 ) 2 ⋅3H 2 O, and zirconium phosphate are formed. Electrochemical impedance spectroscopy is conducted to investigate the mechanism. Zr&O plasma implanted samples offers 37-fold decrease in i corr , 62-fold decrease in R P , much lower CPE 1 , and much higher phase maxima. Plasma ion implantation is an effective technique to modify the initial corrosion resistance of ZK60 Mg alloy.