Abstract: Summarized here in the paper is the law of high-temperature oxidation kinetics.And the oxidation phenomenon of the Cr-Ni alloy piercing plug is analyzed,based on which the development direction for optimization of oxidation process for the said plug is proposed.The analysis result leads to the conclusion as follows.The thickness of oxide film not only affects the oxidation mechanism,but also characterizes the oxidation rate,which is an important research index.In the oxidation process,Fe is the main participant,and Cr is the important antioxidant element,while Ni can improve the bonding force between the film and the substrate;different oxidation atmospheres and temperatures change the structure of the oxide layer,so the weak oxidizing atmosphere should be kept during the piercing process so as to obtain more FeO;the product quality and economic profit of the piercing plug shall be enhanced,and the application scope shall be significantly expanded,provided a compact oxidation film of the plug is assured of via atmosphere-controlled oxidation process.