根据不同一元酸（或碱）滴定曲线先出现先不变的特点，提出一种改进的潜变量投影法，定义了单变信息区，推导了求变换向量的公式，该法可分析两种一元极弱酸（或碱）的混合物灰色体系，已用于邻氯苯酚和对氯苯酚混合物两维ｐＨ滴定分析，得到分布系数和浓度分布，结果表明，预报准确度较高。 According to the fact that the titration curve of monobasic acid (or base) first shows invariability first, an improved latent variable projection method is proposed, the single variable information region is defined, and the formula for calculating the transformation vector is deduced. The method can analyze two kinds of one yuan A very weak acid (or base) mixture gray system has been used for the two-dimensional pH titration analysis of o-chlorophenol and p-chlorophenol mixtures to obtain the distribution coefficient and concentration distribution. The results show that the prediction accuracy is high.