Ignition-proof magnesium alloy was acquired by the addition of rare earth elements(Y,Ce). The alloy at 1 173 K exposure to air for 0.5 h can not be ignited. XRD and SEM analysis revealed that the protective oxide film with two layers structure was formed on the surface of Mg-Y-Ce alloy. Thermogravimetric measurements indicated that the oxidation dynamics curve measured at 673 K and 773 K follows the parabolic-line law and the curve investigated at 873 K follows complicate quartic law.