介绍在双层辉光离子渗金属研究中，用多元回归法确定Ｗ、Ｍｏ渗入曲线方程，从而用求导法得到曲线在某一点的切线斜率，用定积分方法求得从而可求。方法较图解积分法可靠、准确、简便。文中给出Ｗ、Ｍｏ在γ－Ｆｅ中等温扩散系数随浓度的变化关系。 Introduction In the study of double glow ion infiltration of metals, the W and Mo infiltration curve equations were determined by multiple regression method, and the tangent slope at a certain point of the curve was obtained by the derivation method, which can be obtained by the definite integral method. The method is more reliable, accurate and simpler than the integral method. The relationship between the isothermal diffusion coefficient of W and Mo in γ-Fe with concentration is given in the paper.