Today’s construction quality signifies a lot to the tomorrow’s rate of return on investment for the project. The supplier selection has a pivotal role in engineering management; it occupies an important place for ensuring the construction quality in the project construction activities. So choosing suitable suppliers has become to be an important development strategy of the modern construction enterprise. The principal component analysis, one of the multivariate statistical analyses, particularly applicable to this kind of problem. This article systematically discusses this method of choice and evaluation to the supplier, and puts forward views that use principal component analysis to evaluation supplier is practical and scientific, and gives a practical case.