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The mould is an important equipment of the CCM continuous casting machine, which is responsible for the solidification and forming of the molten steel. In the process of continuous casting, the inner surface of the copper mould tube is in contact with the high-temperature molten steel, and is affected by the chemical corrosion of the molten steel, thermal erosion and friction with the mould shell, etc., the copper tube is prone to thermal deformation and surface scratches, affecting the continuous casting production and deteriorating the quality of the slab. Due to the different types of production and management systems, different steel manufacturers have different scrapping standards for copper mould tubes. Usually, the mold life is calibrated by the amount of steel passing through the mould. The judgment of the expiry life of the copper mould tube is mainly based on two important parameters, namely, the reverse taper and the wear amount. In fact, these two parameters also affect each other.