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The application of magnesium and its alloy as degradable biomaterials is mainly confined due to its high degradation rates in physiological environment.This research focused on the effects of micro-arc oxidation (MAO) on biodegradable behavior of this Mg-Y-Zn magnesium alloy in simulated body fluid (SBF).The corrosion rates of alloys were gauged by means of hydrogen evolution volume measurement and weight-loss method.SEM was utilized to observe the surface of the magnesium alloy and the cross-section of oxidation coating layer before and after corrosion.The Mg-Y-Zn with thicker oxidation coating exhibited greater corrosion resistance during the immersion test for 240h.