UVE是基于PLS回归系数建立的一种波长选择方法，这种方法的基本思想是将回归系数作为波长重要性的衡量指标。该方法将一定变量数目的随机变量矩阵加入到光谱矩阵中，然后通过蒙特卡洛交互验证或者传统的交互验证建立PLS模型，通过计算PLS回归系数平均值与标准偏差的比值，选取有效光谱信息。-UVE was established based on PLS regression coefficient of a wavelength selection method, the basic idea of this method is that the regression coefficient as a measure of the importance of wavelength.The method to add a certain variable number of random variable matrix to the spectral matrix, and then through the monte carlo interaction validation or traditional interaction validation PLS model is set up, by calculating the average PLS regression coefficients and the ratio of standard deviation,　effective spectral information.