The thesis applies Analytic Hierarchy Process on supplier selection qualitatively and quantitatively. The basic principle and major steps of Analytic Hierarchy Process were explained. Taking an example of the supplier selection in aviation field, the paper establishes the mathematics model and the supplier evaluation system. At last, the best suppliers were determined through calculating the comparison matrices. The result indicates that the method can provide reference for the following supplier selection , and improve the accuracy of the decisionmaking during all kinds of complex factors.