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简要介绍在电脑探伤仪上使用的三种绘制DAC曲线方法：直接连线法、最小二乘法及拉格朗日（Lagrange）插值法，比较了使用这三种方法绘制DAC曲线的结果，指出了拉格朗日插值法是比较理想的方法。
This paper briefly introduces three methods of drawing DAC curves used in computer flaw detector: direct connection method, least squares method and Lagrange interpolation method. The results of using these three methods to draw DAC curves are compared. Lagrange interpolation is the ideal method.