This method is also used to evaluate and select the suppliers in the global and dynamical angle . this paper comes up with a new algorithm of multivariate pci based on coefficient of variation ( cv ) aiming at the flaw of the principle component analysis 其次針對基于主成份分析的思想計算多元過程能力指數(shù)的不足,本文提出了基于差異系數(shù)的多元過程能力指數(shù)的計算方法,實例證明該方法更加符合實際。